chore: rename headful -> headed #2773

Job	Run time
stable (windows-latest, chrome)	8m 48s
stable (macos-latest, chrome)	11m 33s
stable (macos-latest, msedge)	24m 15s
Java_21 (firefox)	12m 54s
stable (windows-latest, msedge)	35m 0s
Java_21 (webkit)	9m 36s
dev (ubuntu-latest, chromium)	6m 36s
stable (ubuntu-latest, chrome)	7m 49s
Java_21 (chromium)	5m 56s
dev (windows-latest, firefox)	14m 14s
dev (windows-latest, webkit)	8m 47s
dev (ubuntu-latest, webkit)	9m 41s
dev (windows-latest, chromium)	7m 45s
dev (macos-latest, webkit)	30m 34s
dev (ubuntu-latest, firefox)	13m 19s
dev (macos-latest, firefox)	15m 23s
dev (macos-latest, chromium)	6m 22s
	3h 48m 32s

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