[2026] Tracking issue for flaky tests

[trivikr]

This is 2026 equivalent of #3787 where maintainers had reduced flaky tests.
We can use this issue for tracking, and create sub-issues per test failure?

[trivikr]

We should probably switch resource teardown in after instead of finally in all tests

From review comments:

• fix(socks5): use configured connector in Socks5ProxyAgent #5168 (comment)
• fix: reuse parser WeakRef for timeout callbacks #5125 (comment)