Refactor AdaptiveServerState.forceFindOpenFileOrRead #2008

Job	Run time
Build on windows-latest for repo global.json	1m 46s
Build on windows-latest for 6.0	2m 14s
Build on windows-latest for 7.0	1m 47s
Build on windows-latest for 8.0	2m 12s
Build on macos-latest for repo global.json	51s
Build on macos-latest for 6.0	1m 12s
Build on macos-latest for 7.0	1m 5s
Build on macos-latest for 8.0	1m 49s
Build on ubuntu-latest for repo global.json	34s
Build on ubuntu-latest for 6.0	45s
Build on ubuntu-latest for 7.0	41s
Build on ubuntu-latest for 8.0	41s
	15m 37s

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