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Summary -- This PR implements detecting the use of `await` expressions outside of async functions. This is a reimplementation of [await-outside-async (PLE1142)](https://docs.astral.sh/ruff/rules/await-outside-async/) as a semantic syntax error. Despite the rule name, PLE1142 also applies to `async for` and `async with`, so these are covered here too. Test Plan -- Existing PLE1142 tests. I also deleted more code from the `SemanticSyntaxCheckerVisitor` to avoid changes in other parser tests.