Identify if git user configs are saved

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Migrated from https://github.com/mlcommons/mlperf-automations_archived/issues/28
Originally created by @arjunsuresh on *Fri, 28 Jun 2024 17:00:40 GMT*

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While applying patches to a newly pulled git repo, a user identity is needed. It'll be good to check if a global user identity is set and if not use a dummy user identity.