Enable committer_email feature flag to true

Hunter Stewartrequested to merge
557161-enable-true into master

What does this MR do and why?

Enable committer_email feature flag to true

This means when the rails app asks for commit data it will also look for the committer_email. This was behind a feature flag because it was a new behavior in Gitaly. It has been enabled in production for over a day and now this commit changes default_enabled to true.

Changelog: added

Related to #557161 (closed)

Edited by Hunter Stewart

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