Tidy error: `src/test/ui` contains over 1418 files

[henryboisdequin]

A directory with over 1418 files is not allowed by tidy. In #82720, the files exceeded the limit of tidy (it's hard coded). And produced this error:

tidy check
tidy error: following path contains more than 1418 entries, you should move the test to some relevant subdirectory (current: 1419): /checkout/src/test/ui
Found 435 error codes
Found 0 error codes with no tests
Done!
some tidy checks failed
some tidy checks failed

This issue calls for sorting of all strangling files in src/test/ui.

@rustbot claim

[Mark-Simulacrum]

Closing as a duplicate of #73494.