Rollup merge of rust-lang#87600 - JohnTitor:classify-ui-tests, r=petrochenkov

Move some UI tests to more suitable subdirs

The classifui result: https://gist.github.com/JohnTitor/c9e00840990b5e4a8fc562ec3571e427/e06c42226c6038da91e403c33b9947843420cf44

Some notes:
- backtrace-debuginfo.rs: previously I skipped this, I'm still not sure what the best dir is. Any ideas?
- estr-subtyping.rs: Seems a quite old test so removed, shouldn't?
- deref-suggestion.rs: moved to inference as `suggestions` is not an ideal dir.
- issue-43023.rs: a bit misclassified, moved to `derives`

cc rust-lang#73494
r? ``@petrochenkov``

Author: JohnTitor

src/test/ui/issues/issue-37222.rs renamed to src/test/ui/consts/issue-37222.rs

@@ -8,7 +8,7 @@ use std::path::Path;
 const ENTRY_LIMIT: usize = 1000;
 // FIXME: The following limits should be reduced eventually.
 const ROOT_ENTRY_LIMIT: usize = 1345;
-const ISSUES_ENTRY_LIMIT: usize = 2530;
+const ISSUES_ENTRY_LIMIT: usize = 2525;
 
 fn check_entries(path: &Path, bad: &mut bool) {
     let dirs = walkdir::WalkDir::new(&path.join("test/ui"))