Add SourcePath version of getPathToOutput
Add SourcePath version of getPathToOutput

Summary:
The plan goes:
 1. Add getSourcePathToOutput
 2. Change all callers from getPathToOutput to getSourcePathToOutput
 3. Remove existing getPathToOutput methods, migrating their implementations to getSourcePathToOutput
 4. Success!

Test Plan: CI

Reviewed By: Coneko

fbshipit-source-id: f727132

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