test: unflake TestPageClock (#1699) #2525

Job	Run time
Java_21 (chromium)	4m 36s
stable (ubuntu-latest, chrome)	6m 12s
dev (ubuntu-latest, chromium)	5m 30s
stable (windows-latest, chrome)	9m 42s
dev (ubuntu-latest, firefox)	11m 19s
stable (macos-latest, chrome)	30m 21s
dev (ubuntu-latest, webkit)	30m 13s
Java_21 (firefox)	10m 10s
stable (windows-latest, msedge)	23m 26s
dev (windows-latest, chromium)	7m 26s
Java_21 (webkit)	30m 15s
stable (macos-latest, msedge)	30m 19s
dev (windows-latest, firefox)	13m 37s
dev (windows-latest, webkit)	8m 27s
dev (macos-latest, chromium)	11m 37s
dev (macos-latest, firefox)	14m 52s
dev (macos-latest, webkit)	30m 16s
	4h 38m 18s

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