Rollup merge of #140036 - jieyouxu:ui-cleanup-4, r=compiler-errors
Advent of `tests/ui` (misc cleanups and improvements) [4/N] Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of #133895. ### Review advice - Best reviewed commit-by-commit. - I can squash commits before merge, commits are separate to make it easier to review.
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