…_streams: port server cases to IsolatedAsyncioTestCase" (#98015)

This PR reverts gh-93369 and gh-97896 because they've made asyncio tests unstable. After these PRs were merged, random GitHub action jobs of random commits started to fail unrelated tests and test framework methods.

The reverting is necessary because such shrapnel failures are a symptom of some underlying bug that must be found and fixed first.

I had a hope that it's a server overload because we already have extremely rare disc access errors. However, one and a half day passed, and the failures continue to emerge both in PRs and commits.

Affected issue: gh-93357.
First reported in #97940 (comment).

* Revert "gh-93357: Port test cases to IsolatedAsyncioTestCase, part 2 (#97896)"

This reverts commit 09aea94.

* Revert "gh-93357: Start porting asyncio server test cases to IsolatedAsyncioTestCase (#93369)"

This reverts commit ce8fc18.

* main: (38 commits)
  pythongh-92886: make test_ast pass with -O (assertions off) (pythonGH-98058)
  pythongh-92886: make test_coroutines pass with -O (assertions off) (pythonGH-98060)
  pythongh-57179: Add note on symlinks for os.walk (python#94799)
  pythongh-94808: Fix regex on exotic platforms (python#98036)
  pythongh-90085: Remove vestigial -t and -c timeit options (python#94941)
  pythonGH-83901: Improve Signature.bind error message for missing keyword-only params (python#95347)
  pythongh-61105: Add default param, note on using cookiejar subclass (python#95427)
  pythongh-96288: Add a sentence to `os.mkdir`'s docstring. (python#96271)
  pythongh-96073: fix backticks in NEWS entry (pythonGH-98056)
  pythongh-92886: [clinic.py] raise exception on invalid input instead of assertion (pythonGH-98051)
  pythongh-97997: Add col_offset field to tokenizer and use that for AST nodes (python#98000)
  pythonGH-88968: Reject socket that is already used as a transport (python#98010)
  pythongh-96346: Use double caching for re._compile() (python#96347)
  pythongh-91708: Revert params note in urllib.parse.urlparse table (python#96699)
  pythongh-96265: Fix some formatting in faq/design.rst (python#96924)
  pythongh-73196: Add namespace/scope clarification for inheritance section (python#92840)
  pythongh-97646: Change `.js` and `.mjs` files mimetype to conform to RFC 9239 (python#97934)
  pythongh-97923: Always run Ubuntu SSL tests with others in CI (python#97940)
  pythongh-97956: Mention `generate_global_objects.py` in `AC How-To` (python#97957)
  pythongh-96959: Update HTTP links which are redirected to HTTPS (python#98039)
  ...

…o.test_streams: port server cases to IsolatedAsyncioTestCase" (python#98015)

This PR reverts pythongh-93369 and pythongh-97896 because they've made asyncio tests unstable. After these PRs were merged, random GitHub action jobs of random commits started to fail unrelated tests and test framework methods.

The reverting is necessary because such shrapnel failures are a symptom of some underlying bug that must be found and fixed first.

I had a hope that it's a server overload because we already have extremely rare disc access errors. However, one and a half day passed, and the failures continue to emerge both in PRs and commits.

Affected issue: pythongh-93357.
First reported in python#97940 (comment).

* Revert "pythongh-93357: Port test cases to IsolatedAsyncioTestCase, part 2 (python#97896)"

This reverts commit 09aea94.

* Revert "pythongh-93357: Start porting asyncio server test cases to IsolatedAsyncioTestCase (python#93369)"

This reverts commit ce8fc18.

…#97940)