git-utils: deleted unused functions #4553

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	1m 4s
Ruby analysis (macos-latest, linked)	1m 19s
Ruby analysis (ubuntu-latest, linked)	46s
Ruby analysis (macos-latest, default)	1m 20s
Ruby analysis (ubuntu-latest, default)	45s
Ruby analysis (ubuntu-latest, nightly-latest)	46s
	6m 0s

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