Ensure project cache initialization happens only once #6569
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Based on #6568. Review that one first. First commit of this PR is Don't launch debugger window for all tests.
Context
Turns out the VS workaround was initializing the plugin on every project query, thus crashing the cache.
Changes Made
Initialization is happening only once now.
ProjectCacheService
is now asserting that it's always in expected states.Testing
Unit tests.
Notes
Does not affect non project cache code paths so should be no risk for 16.11.