Port TypeScript #62722: Widen reverse mapped type properties #9377

Job	Run time
build	4m 10s
extension	36s
tidy	1m 24s
generate	11m 11s
lint (noembed)	5m 53s
lint (windows-latest)	11m 21s
lint (ubuntu-latest)	6m 5s
smoke	6m 16s
test (concurrent test programs)	12m 49s
misc	1m 29s
format	1m 58s
test (windows-latest)	22m 25s
test (ubuntu-latest)	12m 27s
test (noembed)	9m 54s
test (no submodules)	8m 18s
test (race mode)	17m 27s
required	4s
	2h 13m 47s

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