fix!: change default `pool` to `'forks'` #9284

Job	Run time
test-ui	45s
test (ubuntu-latest, 18)	9m 52s
test-browser (chrome, chromium)	6m 29s
test (ubuntu-latest, 20)	6m 14s
lint	55s
test-browser (firefox, firefox)	4m 3s
test (macos-14, 20)	5m 49s
test-browser (edge, webkit)	3m 7s
test-browser-windows (chrome, chromium)	6m 28s
test (windows-latest, 20)	10m 44s
test-browser-windows (edge, webkit)	6m 38s
test-ui-e2e (ubuntu-latest)	2m 1s
test-ui-e2e (macos-14)	2m 3s
test-ui-e2e (windows-latest)	4m 23s
	1h 9m 31s

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