Fix temp file filtering in FileTracker #8353
                
     Merged
            
            
          
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(Copied from #8351)
Fixes AB#1678521
Context
#8049 broke the temp filtering logic by using the MSBuild-specific temp path instead of the true base temp path. This manifests as an overbuild of some C++ projects.
Changes Made
Reverted the change. Enabled relevant unit tests.
Testing
Existing unit tests and a C++ end-to-end repro.
Notes
The rest of FileTracker tests cannot be enabled without significant work (related to #649).