remove typechecks from cache on file close (#1187) #1927

Job	Run time
Build on windows-latest for repo global.json	15m 35s
Build on windows-latest for 6.0 stable	15m 5s
Build on windows-latest for 7.0 preview	18m 30s
Build on macos-latest for repo global.json	14m 35s
Build on macos-latest for 6.0 stable	19m 35s
Build on macos-latest for 7.0 preview	20m 39s
Build on ubuntu-latest for repo global.json	12m 54s
Build on ubuntu-latest for 6.0 stable	13m 56s
Build on ubuntu-latest for 7.0 preview	13m 34s
	2h 24m 23s

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