chore: add typescript declarations to .gitignore #10043

Job	Run time
lint	11m 14s
cover (18.x, ubuntu-latest)	2m 3s
test (18.x, ubuntu-latest)	3m 40s
cover (20.x, ubuntu-latest)	1m 51s
test (20.x, ubuntu-latest)	3m 11s
test-async-hooks (18, ubuntu-latest)	34s
test (22.4.1, ubuntu-latest)	3m 0s
test-async-hooks (20, ubuntu-latest)	33s
test262 (18.x, ubuntu-latest)	32s
test262 (20.x, ubuntu-latest)	27s
test-xs (20.x, 5.0.0, ubuntu-latest)	34s
viable-release (18.x, ubuntu-latest)	6m 38s
viable-release (20.x, ubuntu-latest)	6m 16s
	40m 33s

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