Rewrite use-statement-duplicate-check-7663 test

[qaijuang]

Fixes #140780.

This supersedes the abandoned earlier attempt in #141060, which targeted an older test layout.

The existing use-statement-duplicate-check-7663 test had drifted away from the behavior from #7663 and no longer exercised duplicate import handling at all.

This rewrites the test as a revision-based UI test that covers the three relevant cases:

• using the same name through two glob imports is ambiguous
• importing the same name explicitly twice is rejected
• an explicit import still wins over a glob import

Verification

• ./x test tests/ui/modules --test-args use-statement-duplicate-check-7663

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[Kivooeo]

Hi, thanks for you contribution!

Before proceeding with the review, could you briefly describe any use of LLMs for creation of this PR?

Thanks!

[qaijuang]

Yes, for aid with PR description