[flake8-async] allow async generators (ASYNC100)

[autinerd]

Summary

Treat async generators as "await" in ASYNC100.

Fixes #13637

Test Plan

Updated snapshot

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.

[zanieb]

Actually, if I add this test case to main I don't see a violation (i.e., the snapshots do not change) but if I use your example from the issue they do. It seems like your new test case is not sufficient, can you add one that raises the false positive?

[zanieb]

(needs described test change)

[autinerd]

I have changed the test.