remove typechecks from cache on file close #1926

Job	Run time
Build on windows-latest for repo global.json	15m 5s
Build on windows-latest for 6.0 stable	16m 38s
Build on windows-latest for 7.0 preview	16m 23s
Build on macos-latest for repo global.json	17m 2s
Build on macos-latest for 6.0 stable	14m 35s
Build on macos-latest for 7.0 preview	15m 56s
Build on ubuntu-latest for repo global.json	11m 52s
Build on ubuntu-latest for 6.0 stable	12m 2s
Build on ubuntu-latest for 7.0 preview	14m 46s
	2h 14m 19s

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