* ci: enable goma for all testing builds
* Use powershell script to start goma on Windows
* Only run ensure_start from PS script.
* add missing percent
* Run stats via command instead of powershell
* use command env var
* Use out cache for faster mac builds
* Disable unneeded logging
* .git directories need to be delete before gn gen
Even though gn gen shows and error about a missing .git directory, the .git delete needs to happen before gn gen.
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