fix: don't crash when calling useFakeTimers in VM pool #5850

Job	Run time
test (ubuntu-latest, 16)	13m 0s
test (ubuntu-latest, 18)	12m 10s
test (macos-latest, 18)	17m 13s
test (windows-latest, 18)	22m 14s
lint	2m 22s
test-ui	2m 32s
test-browser (chrome, chromium)	5m 15s
test-browser (firefox, firefox)	7m 27s
test-browser (edge, webkit)	7m 22s
typecheck	4m 9s
test-browser-safari	11m 16s
test-browser-windows (chrome, chromium)	9m 47s
test-browser-windows (edge, webkit)	13m 11s
	2h 7m 58s

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