Drop atomicwrites dependency

[nicoddemus]

I took care of adding the files unchanged in the first commit, so we can track the exact changes that were done.

Closes #10114

[nicoddemus]

I did try to replace this call with os.replace and using this implementation on windows (as suggested in #10114 (comment)), however I get test failures:

λ pytest testing\test_atomic_writes.py
======================== test session starts ========================
platform win32 -- Python 3.9.8, pytest-7.2.0.dev91+g1689b3886.d20220613, pluggy-1.0.0
rootdir: e:\projects\pytest, configfile: pyproject.toml
plugins: hypothesis-6.34.1, flake8-1.0.7, flakes-4.0.5
collected 6 items

testing\test_atomic_writes.py F.F..F                           [100%]

============================= FAILURES ==============================
_________________________ test_atomic_write _________________________

tmp_path = WindowsPath('E:/.tmp/pytest-of-Pichau/pytest-3049/test_atomic_write0')

    def test_atomic_write(tmp_path: Path) -> None:
        fname = tmp_path.joinpath("ha")
        for i in range(2):
            with atomic_write(str(fname), overwrite=True) as f:
>               f.write("hoho")

testing\test_atomic_writes.py:19:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
C:\Python39\lib\contextlib.py:126: in __exit__
    next(self.gen)
src\_pytest\atomic_writes.py:146: in _open
    self.commit(f)
src\_pytest\atomic_writes.py:181: in commit
    replace_atomic(f.name, self._path)
src\_pytest\atomic_writes.py:80: in replace_atomic
    return _replace_atomic(src, dst)
src\_pytest\atomic_writes.py:36: in _replace_atomic
    _sync_directory(os.path.normpath(os.path.dirname(dst)))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

directory = 'E:\\.tmp\\pytest-of-Pichau\\pytest-3049\\test_atomic_write0'

    def _sync_directory(directory):
        # Ensure that filenames are written to disk
>       fd = os.open(directory, 0)
E       PermissionError: [Errno 13] Permission denied: 'E:\\.tmp\\pytest-of-Pichau\\pytest-3049\\test_atomic_write0'

src\_pytest\atomic_writes.py:28: PermissionError
_____________ test_replace_simultaneously_created_file ______________

tmp_path = WindowsPath('E:/.tmp/pytest-of-Pichau/pytest-3049/test_replace_simultaneously_cr0')

    def test_replace_simultaneously_created_file(tmp_path: Path) -> None:
        fname = tmp_path.joinpath("ha")
        with atomic_write(str(fname), overwrite=True) as f:
            f.write("hoho")
            fname.write_text("harhar")
>           assert fname.read_text() == "harhar"

testing\test_atomic_writes.py:45:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
C:\Python39\lib\contextlib.py:126: in __exit__
    next(self.gen)
src\_pytest\atomic_writes.py:146: in _open
    self.commit(f)
src\_pytest\atomic_writes.py:181: in commit
    replace_atomic(f.name, self._path)
src\_pytest\atomic_writes.py:80: in replace_atomic
    return _replace_atomic(src, dst)
src\_pytest\atomic_writes.py:36: in _replace_atomic
    _sync_directory(os.path.normpath(os.path.dirname(dst)))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

directory = 'E:\\.tmp\\pytest-of-Pichau\\pytest-3049\\test_replace_simultaneously_cr0'

    def _sync_directory(directory):
        # Ensure that filenames are written to disk
>       fd = os.open(directory, 0)
E       PermissionError: [Errno 13] Permission denied: 'E:\\.tmp\\pytest-of-Pichau\\pytest-3049\\test_replace_simultaneously_cr0'

src\_pytest\atomic_writes.py:28: PermissionError
_____________________ test_atomic_write_in_pwd ______________________

tmp_path = WindowsPath('E:/.tmp/pytest-of-Pichau/pytest-3049/test_atomic_write_in_pwd0')

    def test_atomic_write_in_pwd(tmp_path: Path) -> None:
        orig_curdir = os.getcwd()
        try:
            os.chdir(str(tmp_path))
            fname = "ha"
            for i in range(2):
                with atomic_write(str(fname), overwrite=True) as f:
>                   f.write("hoho")

testing\test_atomic_writes.py:86:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
C:\Python39\lib\contextlib.py:126: in __exit__
    next(self.gen)
src\_pytest\atomic_writes.py:146: in _open
    self.commit(f)
src\_pytest\atomic_writes.py:181: in commit
    replace_atomic(f.name, self._path)
src\_pytest\atomic_writes.py:80: in replace_atomic
    return _replace_atomic(src, dst)
src\_pytest\atomic_writes.py:36: in _replace_atomic
    _sync_directory(os.path.normpath(os.path.dirname(dst)))
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

directory = '.'

    def _sync_directory(directory):
        # Ensure that filenames are written to disk
>       fd = os.open(directory, 0)
E       PermissionError: [Errno 13] Permission denied: '.'

src\_pytest\atomic_writes.py:28: PermissionError
====================== short test summary info ======================
FAILED testing/test_atomic_writes.py::test_atomic_write - PermissionError: [Errno 13] Permission denied: 'E:\\.tmp\\pytest-...
FAILED testing/test_atomic_writes.py::test_replace_simultaneously_created_file - PermissionError: [Errno 13] Permission denied: 'E:\\.tmp\\pytest-...
FAILED testing/test_atomic_writes.py::test_atomic_write_in_pwd - PermissionError: [Errno 13] Permission denied: '.'
==================== 3 failed, 3 passed in 0.20s ====================

Decided to leave this as is instead of investigating further, but suggestions are welcome.

[The-Compiler]

Have you seen #10115? There at least the CI seems to pass, though I have no idea to what extent we have tests for #3008/#3390.

[nicoddemus]

Argh no I didn't!

[nicoddemus]

Closing in favor of #10115