fix(qsync): Hightlighting level is always updated after 'enable analy…

[tpasternak]

…sis'

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• I have filed an issue about this change and discussed potential changes with the maintainers.
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• This is not a stylistic, refactoring, or cleanup change.

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Description of this change

[LeFrosch]

Just installed plugin from master, getting lots of these:

com.intellij.openapi.diagnostic.RuntimeExceptionWithAttachments: Read access is allowed from inside read-action only (see Application.runReadAction()); If you access or modify model on EDT consider wrapping your code in WriteIntentReadAction  or ReadAction; see https://jb.gg/ij-platform-threading for details
Current thread: Thread[#113,BlazeExecutor,4,main] 613902271 (EventQueue.isDispatchThread()=false)
SystemEventQueueThread: Thread[#66,AWT-EventQueue-0,6,main] 1870111808
	at com.intellij.util.concurrency.ThreadingAssertions.createThreadAccessException(ThreadingAssertions.java:218)
	at com.intellij.util.concurrency.ThreadingAssertions.softAssertReadAccess(ThreadingAssertions.java:155)
	at com.intellij.psi.impl.file.impl.FileManagerImpl.findFile(FileManagerImpl.java:375)
	at com.intellij.psi.impl.PsiManagerImpl.findFile(PsiManagerImpl.java:163)
	at com.google.idea.blaze.base.qsync.QuerySyncHighlightingResetListener.onNewProjectSnapshot(QuerySyncHighlightingResetListener.java:24)

[tpasternak]

#7110