Monitor all git commands; move blame to git package and replace git as a variable (#6864)
* monitor all git commands; move blame to git package and replace git as a variable
* use git command but not other commands
* fix build
* move exec.Command to git.NewCommand
* fix fmt
* remove unrelated changes
* remove unrelated changes
* refactor IsEmpty and add tests
* fix tests
* fix tests
* fix tests
* fix tests
* remove gitLogger
* fix fmt
* fix isEmpty
* fix lint
* fix tests
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