Test/warning cleanups #2628

Job	Run time
dev (ubuntu-latest, chromium)	8m 58s
dev (ubuntu-latest, firefox)	17m 41s
dev (ubuntu-latest, webkit)	25m 1s
dev (windows-latest, chromium)	9m 34s
dev (windows-latest, firefox)	18m 52s
dev (windows-latest, webkit)	9m 56s
dev (macos-latest, chromium)	1s
dev (macos-latest, firefox)	1s
dev (macos-latest, webkit)	1s
Java_21 (chromium)	8m 18s
Java_21 (firefox)	18m 6s
stable (ubuntu-latest, chrome)	9m 56s
Java_21 (webkit)	25m 1s
stable (windows-latest, chrome)	17m 48s
stable (macos-latest, chrome)	1s
stable (windows-latest, msedge)	24m 57s
stable (macos-latest, msedge)	1s
	3h 14m 13s

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