2.14.0: create temporary directory in source tree before build trashes build

**Describe the bug**

Looks like some bits are still missing in pyproject.toml and create  temporary directory during packaging process (`SPECPARTS`) trashes build. Here is `build` output:

```console

+ /usr/bin/python3 -sBm build -w --no-isolation

* Getting build dependencies for wheel...

No `packages` or `py_modules` configuration, performing automatic discovery.

`flat-layout` detected -- analysing .

discovered packages -- ['aiobotocore', 'SPECPARTS', 'aiobotocore.retries']

Traceback (most recent call last):

  File "/usr/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>

    main()

  File "/usr/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 335, in main

    json_out['return_val'] = hook(**hook_input['kwargs'])

  File "/usr/lib/python3.10/site-packages/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel

    return hook(config_settings)

  File "/usr/lib/python3.10/site-packages/setuptools/build_meta.py", line 332, in get_requires_for_build_wheel

    return self._get_build_requires(config_settings, requirements=[])

  File "/usr/lib/python3.10/site-packages/setuptools/build_meta.py", line 302, in _get_build_requires

    self.run_setup()

  File "/usr/lib/python3.10/site-packages/setuptools/build_meta.py", line 318, in run_setup

    exec(code, locals())

  File "<string>", line 1, in <module>

  File "/usr/lib/python3.10/site-packages/setuptools/__init__.py", line 117, in setup

    return distutils.core.setup(**attrs)

  File "/usr/lib/python3.10/site-packages/setuptools/_distutils/core.py", line 158, in setup

    dist.parse_config_files()

  File "/usr/lib/python3.10/site-packages/setuptools/dist.py", line 608, in parse_config_files

    pyprojecttoml.apply_configuration(self, filename, ignore_option_errors)

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 71, in apply_configuration

    config = read_configuration(filepath, True, ignore_option_errors, dist)

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 143, in read_configuration

    return expand_configuration(asdict, root_dir, ignore_option_errors, dist)

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 168, in expand_configuration

    return _ConfigExpander(config, root_dir, ignore_option_errors, dist).expand()

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 216, in expand

    self._expand_all_dynamic(dist, package_dir)

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 261, in _expand_all_dynamic

    version=self._obtain_version(dist, package_dir),

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 312, in _obtain_version

    self._obtain(dist, "version", package_dir)  # pyright: ignore[reportArgumentType]

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 299, in _obtain

    return self._expand_directive(

  File "/usr/lib/python3.10/site-packages/setuptools/config/pyprojecttoml.py", line 293, in _expand_directive

    return _expand.read_attr(directive["attr"], package_dir, root_dir)

  File "/usr/lib/python3.10/site-packages/setuptools/config/expand.py", line 179, in read_attr

    path = _find_module(module_name, package_dir, root_dir)

  File "/usr/lib/python3.10/site-packages/setuptools/config/expand.py", line 225, in _find_module

    path_start = find_package_path(module_name, package_dir or {}, root_dir)

  File "/usr/lib/python3.10/site-packages/setuptools/config/expand.py", line 440, in __len__

    return len(self._target())

  File "/usr/lib/python3.10/site-packages/setuptools/config/expand.py", line 433, in _target

    self._value = self._obtain()

  File "/usr/lib/python3.10/site-packages/setuptools/config/expand.py", line 403, in _get_package_dir

    self()

  File "/usr/lib/python3.10/site-packages/setuptools/config/expand.py", line 388, in __call__

    self._dist.set_defaults(name=False)  # Skip name, we can still be parsing

  File "/usr/lib/python3.10/site-packages/setuptools/discovery.py", line 346, in __call__

    self._analyse_package_layout(ignore_ext_modules)

  File "/usr/lib/python3.10/site-packages/setuptools/discovery.py", line 380, in _analyse_package_layout

    or self._analyse_flat_layout()

  File "/usr/lib/python3.10/site-packages/setuptools/discovery.py", line 437, in _analyse_flat_layout

    return self._analyse_flat_packages() or self._analyse_flat_modules()

  File "/usr/lib/python3.10/site-packages/setuptools/discovery.py", line 443, in _analyse_flat_packages

    self._ensure_no_accidental_inclusion(top_level, "packages")

  File "/usr/lib/python3.10/site-packages/setuptools/discovery.py", line 473, in _ensure_no_accidental_inclusion

    raise PackageDiscoveryError(cleandoc(msg))

setuptools.errors.PackageDiscoveryError: Multiple top-level packages discovered in a flat-layout: ['SPECPARTS', 'aiobotocore'].



To avoid accidental inclusion of unwanted files or directories,

setuptools will not proceed with this build.



If you are trying to create a single distribution with multiple packages

on purpose, you should not rely on automatic discovery.

Instead, consider the following options:



1. set up custom discovery (`find` directive with `include` or `exclude`)

2. use a `src-layout`

3. explicitly set `py_modules` or `packages` with a list of names



To find more information, look for "package discovery" on setuptools docs.



ERROR Backend subprocess exited when trying to invoke get_requires_for_build_wheel

```



**Checklist**

- [x] I have reproduced in environment where `pip check` passes without errors

- [x] I have provided `pip freeze` results

- [x] I have provided sample code or detailed way to reproduce

- [x] I have tried the same code in botocore to ensure this is an aiobotocore specific issue

- [x] I have tried similar code in aiohttp to ensure this is is an aiobotocore specific issue

- [x] I have checked the latest and older versions of aiobotocore/aiohttp/python to see if this is a regression / injection



**pip freeze results**



```console

aiohappyeyeballs==2.4.0

aiohttp==3.10.5

aioitertools==0.11.0

aiosignal==1.3.1

alabaster==0.7.16

async-timeout==4.0.3

attrs==24.2.0

Babel==2.15.0

blinker==1.7.0

boto3==1.35.10

botocore==1.35.10

build==1.2.1

cffi==1.16.0

charset-normalizer==3.3.2

click==8.1.7

cryptography==42.0.8

defusedxml==0.7.1

dill==0.3.8

distro==1.9.0

dnf==4.20.0

docker==7.1.0

docutils==0.20.1

exceptiongroup==1.1.3

Flask==3.0.3

Flask-Cors==5.0.0

frozenlist==1.4.1

idna==3.7

imagesize==1.4.1

importlib_metadata==8.0.0

iniconfig==2.0.0

installer==0.7.0

itsdangerous==2.1.2

Jinja2==3.1.4

jmespath==1.0.1

jsonschema==4.20.0

jsonschema-path==0.3.3

jsonschema-specifications==2023.12.1

lazy-object-proxy==1.10.0

libdnf==0.73.3

MarkupSafe==2.1.5

moto==4.1.0.dev0

multidict==6.0.5

openapi-schema-validator==0.6.2

openapi-spec-validator==0.7.1

packaging==24.0

pathable==0.4.3

pluggy==1.5.0

ply==3.11

pycparser==2.22

Pygments==2.18.0

pyproject_hooks==1.0.0

pytest==8.2.2

pytest-asyncio==0.23.8

python-dateutil==2.9.0.post0

pyupgrade==3.16.0

PyYAML==6.0.2

referencing==0.32.0

requests==2.32.3

responses==0.25.3

rfc3339_validator==0.1.4

rpds-py==0.20.0

rpm==4.19.1.1

ruff==0.6.3

s3transfer==0.10.2

snowballstemmer==2.2.0

Sphinx==8.0.2

sphinxcontrib-applehelp==1.0.8

sphinxcontrib-devhelp==1.0.6

sphinxcontrib-htmlhelp==2.0.5

sphinxcontrib-jsmath==1.0.1

sphinxcontrib-qthelp==1.0.7

sphinxcontrib-serializinghtml==2.0.0

tokenize_rt==6.0.0

tomli==2.0.1

typing_extensions==4.12.2

urllib3==2.2.2

Werkzeug==3.0.3

wrapt==1.16.0

xmltodict==0.13.0

yarl==1.9.7

zipp==3.19.2

```



**Environment:**

 - Python Version: 3.10.14

 - OS name and version: Linux x86/64



**Additional context**

Add any other context about the problem here.

[]