[site] add note to per-test-overrides.md #5509

Job	Run time
Build documentation (ubuntu-latest)	1m 22s
Lint (ubuntu-latest)	54s
Lint (windows-latest)	2m 22s
Build and test (ubuntu-latest, 1.81)	5m 8s
Build and test (ubuntu-latest, stable)	3m 18s
Test archives with a target runner	1m 55s
Build and test (macos-14, 1.81)	4m 13s
Build and test (macos-14, stable)	2m 43s
Build and test (windows-latest, 1.81)	7m 24s
Build and test (windows-latest, stable)	6m 33s
Test archives with a runner (destination) (ubuntu-24.04, ubuntu-latest)	11s
Test archives with a runner (destination) (windows-latest, windows-latest)	22s
	36m 25s

Provide feedback