test_asyncio and test_compileall leak temporary files/directories

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Using PR #109290 fix, I found that the two following tests leak temporary files/directories.

test_compileall:

$ ./python -m test -j1 test_compileall --fail-env-changed -m test.test_compileall.CompileallTestsWithSourceEpoch.test_ddir_empty_multiple_workers
0:00:00 load avg: 0.81 Run tests in parallel using 1 child processes
0:00:01 load avg: 0.81 [1/1/1] test_compileall failed (env changed)
Warning -- files was modified by test_compileall
Warning --   Before: []
Warning --   After:  ['pymp-kmfq1ivj/'] 
Warning -- files was modified by test_compileall
Warning --   Before: []
Warning --   After:  ['pymp-kmfq1ivj/']

== Tests result: ENV CHANGED ==

1 test altered the execution environment:
    test_compileall

Total duration: 1.2 sec
Total tests: run=1 (filtered)
Total test files: run=1/1 (filtered) env_changed=1
Result: ENV CHANGED

test.test_asyncio.test_events:

$ ./python -m test -j1 test.test_asyncio.test_events --fail-env-changed -m test.test_asyncio.test_events.TestPyGetEventLoop.test_get_event_loop_new_process 
0:00:00 load avg: 0.65 Run tests in parallel using 1 child processes
0:00:01 load avg: 0.65 [1/1/1] test.test_asyncio.test_events failed (env changed)
Warning -- files was modified by test.test_asyncio.test_events
Warning --   Before: []
Warning --   After:  ['pymp-tvmenicy/'] 
Warning -- files was modified by test.test_asyncio.test_events
Warning --   Before: []
Warning --   After:  ['pymp-tvmenicy/']

== Tests result: ENV CHANGED ==

1 test altered the execution environment:
    test.test_asyncio.test_events

Total duration: 1.4 sec
Total tests: run=1 (filtered)
Total test files: run=1/1 (filtered) env_changed=1
Result: ENV CHANGED

Linked PRs

• gh-109295: Clean up multiprocessing in test_asyncio and test_compileall #109298
• gh-109295: Fix test_os.test_access_denied() for TEMP=cwd #109299
• [3.12] gh-109295: Clean up multiprocessing in test_asyncio and test_compileall (GH-109298) #109301
• [3.11] gh-109295: Clean up multiprocessing in test_asyncio and test_compileall (GH-109298) #109302
• [3.11] gh-109295: Fix test_os.test_access_denied() for TEMP=cwd (GH-109299) #109303
• [3.12] gh-109295: Fix test_os.test_access_denied() for TEMP=cwd (GH-109299) #109304
• gh-109295: Skip test_generated_cases if different mount drives #109308

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Another problem: test_os fails if the TEMP environment variable is equal to the current working directory.

ERROR: test_access_denied (test.test_os.StatAttributeTests.test_access_denied)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "D:\a\cpython\cpython\Lib\test\test_os.py", line 742, in test_access_denied
    create_file(fname, b'ABC')
  File "D:\a\cpython\cpython\Lib\test\test_os.py", line 94, in create_file
    with open(filename, "xb", 0) as fp:
         ^^^^^^^^^^^^^^^^^^^^^^^
FileExistsError: [Errno 17] File exists: 'C:\\Users\\runneradmin\\AppData\\Local\\Temp\\test_python_worker_a5djsgg5\\@test_5340_tmp�'

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Last issue with test_generated_cases:

0:19:14 load avg: 6.45 [2/3/2] test_generated_cases failed (uncaught exception)
Re-running test_generated_cases in verbose mode
test test_generated_cases crashed -- Traceback (most recent call last):
  File "D:\a\cpython\cpython\Lib\test\libregrtest\single.py", line 139, in _runtest_env_changed_exc
    _load_run_test(result, runtests)
  File "D:\a\cpython\cpython\Lib\test\libregrtest\single.py", line 87, in _load_run_test
    test_mod = importlib.import_module(module_name)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\cpython\cpython\Lib\importlib\__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1381, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1354, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1325, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 929, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 1006, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "D:\a\cpython\cpython\Lib\test\test_generated_cases.py", line 11, in <module>
    import generate_cases
  File "D:\a\cpython\cpython\Tools\cases_generator\generate_cases.py", line 41, in <module>
    DEFAULT_INPUT = os.path.relpath(os.path.join(ROOT, "Python/bytecodes.c"))
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\a\cpython\cpython\Lib\ntpath.py", line 791, in relpath
    raise ValueError("path is on mount %r, start on mount %r" % (
ValueError: path is on mount 'D:', start on mount 'C:'

See PR #109290 for the background.