Add warning to git diff to check if it works

Closes #3422537

added 57 commits

• 0270d014...20b726c3 - 47 earlier commits
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added 1 commit

• fedff772 - Pull full repo when cannot find diff

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• 75d0a6db - Use proper git command

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• e5e9e2e2 - Less noise

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• b93b7091 - Test with extra logic for when not needed

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