[syntax-errors]: import from * only allowed at module scope (F406)

[11happy]

Summary

This PR implements F406 https://docs.astral.sh/ruff/rules/undefined-local-with-nested-import-star-usage/ as a semantic syntax error

Test Plan

I have written inline tests as directed in #17412

[11happy]

I have fixed the md file test which was causing CI to fail.

Thank you

[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.

[11happy]

have resolved the merge conflict as well.
Thank you

[11happy]

Hii @ntBre, would appreciate your feedback on this when you get a chance.
Thank you : )

[ntBre]

Thanks, this looks good overall, just a few smaller suggestions. While we're here, can we also update this comment:

ruff/crates/ruff_linter/src/checkers/ast/analyze/unresolved_references.rs

Lines 16 to 22 in f507ff8

	// F406
	checker.report_diagnostic_if_enabled(
	pyflakes::rules::UndefinedLocalWithImportStarUsage {
	name: reference.name(checker.source()).to_string(),
	},
	reference.range(),
	);

I was getting confused about this other case of F406 we're not handling, but I finally realized that the comment is just wrong. It should say F405, which is not a syntax error.

[ntBre]

Thank you! This looks great to me. I just had one more test idea for a future edge case.

[ntBre]

Thank you!