[satiricalguru]

What this PR does

Trainer and Spark run submitted Python functions with a regular function call. An async def containing yield passes the existing coroutine check, but calling it only creates an async iterator. The job can exit successfully without executing the function body.

Reject async generator functions in the shared validator with the existing ValueError for unsupported async functions. The regression test exercises an async def containing yield alongside the existing coroutine case.

Verification

• The new case failed against the unchanged validator and passed with this change.
• The full SDK unit suite, package build, Ruff lint and format checks, Hub type check, and applicable pre-commit hooks passed locally.

Codex helped reproduce the bug, implement the fix, add the regression test, and run verification.

[google-oss-prow]

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