Test/warning cleanups #2612

Job	Run time
stable (ubuntu-latest, chrome)	10m 10s
dev (ubuntu-latest, chromium)	8m 33s
stable (windows-latest, chrome)	18m 42s
dev (ubuntu-latest, firefox)	17m 29s
Java_21 (chromium)	9m 19s
stable (macos-latest, chrome)	12m 34s
dev (ubuntu-latest, webkit)	1h 0m 15s
Java_21 (firefox)	16m 48s
dev (windows-latest, chromium)	16m 2s
stable (windows-latest, msedge)	59m 10s
Java_21 (webkit)	1h 0m 14s
dev (windows-latest, firefox)	21m 18s
stable (macos-latest, msedge)	37m 13s
dev (windows-latest, webkit)	16m 35s
dev (macos-latest, chromium)	8m 2s
dev (macos-latest, firefox)	15m 34s
dev (macos-latest, webkit)	10m 3s
	6h 38m 1s

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