gh-128770: raise warnings as errors in test suite - except for test_socket which still logs warnings, and internal test warnings that are now logged

[graingert]

• Issue: configure warnings as errors in the test suite #128770

[graingert]

@hugovk can I get a run on the buildbots for this PR?

[hugovk]

Certainly!

Let's check if you can do it yourself: either apply one of the test-with-buildbots or test-with-refleak-buildbots labels, or add a comment like ! buildbot optional-regex (but no space between exclamation mark and buildbot) to run a subset.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @graingert for commit c06c3db 🤖

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @graingert for commit 7123093 🤖

If you want to schedule another build, you need to add the 🔨 test-with-buildbots label again.

[graingert]

@hugovk do you know where I can see the status?