Auto merge of rust-lang#102305 - flba-eb:remove_exclude_list, r=Mark-Simulacrum

Get rid of exclude-list for Windows-only tests

Main purpose of this change is to get rid of a quite long (and growing) list of excluded targets, while this test should only be useful on Windows (as far as I understand it). The `// only-windows` header seams to implement exactly what we need here.

I don't know why there are some whitespace changes, but `x.py fmt` and `.git/hooks/pre-push` are happy.

Author: bors