Rollup of 8 pull requests

[Zalathar]

Successful merges:

• Tidy: detect ui tests subdirectory changes so tests/ui/README.md stays in sync #150474 (Tidy: detect ui tests subdirectory changes so tests/ui/README.md stays in sync)
• Improve move error diagnostic for AsyncFn closures #150572 (Improve move error diagnostic for AsyncFn closures)
• Fix -Zmir-enable-passes to detect unregistered enum names in declare_passes macro #151596 (Fix -Zmir-enable-passes to detect unregistered enum names in declare_passes macro)
• Make QueryDispatcher::Qcx an associated type #151802 (Make QueryDispatcher::Qcx an associated type)
• [rustdoc] Add a marker to tell users that there are hidden (deprecated) items in the search results #151559 ([rustdoc] Add a marker to tell users that there are hidden (deprecated) items in the search results)
• Fix contrast ratio for Since element in rustdoc dark theme #151665 (Fix contrast ratio for Since element in rustodoc dark theme)
• Update askama to 0.15.3 #151798 (Update askama to 0.15.3)
• Subscribe myself to translation diagnostics #151800 (Subscribe myself to translation diagnostics)

r? @ghost

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