Sync auto-assign-copilot.yml from .github repo #16

Job	Run time
test-review-and-execution (webkit, headless)	1m 9s
test-review-and-execution (chromium, headed)	54s
test-review-and-execution (chromium, headless)	54s
test-review-and-execution (firefox, headless)	58s
test-review-and-execution (firefox, headed)	38s
test-review-and-execution (webkit, headed)	1m 5s
test-coverage-review	2s
	5m 40s

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