ruff

2250fa6f - Fix syntax error false positives for `await` outside functions (#21763)

Fix syntax error false positives for `await` outside functions (#21763) ## Summary Fixes #21750 and a related bug in `PLE1142`. We were not properly considering generators to be valid `await` contexts, which caused the `F704` issue. One of the tests I added for this also uncovered an issue in `PLE1142` for comprehensions nested within async generators because we were only checking the current scope rather than traversing the nested context. ## Test Plan Both of these rules are implemented as semantic syntax errors, so I added tests (and fixes) in both Ruff and ty.