Add mailmap support to git-cat-file

Siddharth Asthanarequested to merge
edith007/gitaly:issue_4364_add_mailmap_option into master

This MR aims to solve the issue #4364 (closed) by adding --use-mailmap flag to git cat-file --batch processes in gitaly.

The change is behind a feature flag rolled out through: #5394

  • Without --use-mailmap flag image
  • With --use-mailmap flag image
Edited by Siddharth Asthana

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