git-utils: deleted unused functions #3905

Job	Run time
Diagnostic export (macos-latest, linked)	1m 20s
Diagnostic export (windows-latest, linked)	4m 17s
Diagnostic export (ubuntu-latest, linked)	1m 0s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 4s
Diagnostic export (windows-latest, nightly-latest)	3m 54s
Diagnostic export (macos-latest, nightly-latest)	1m 2s
	12m 37s

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