Since replacing Diffusion with Gitiles as Gerrit's repo viewer, we've greatly reduced the utility of having Git repositories in Phabricator. We should do the following:
* For all repos that have not yet been referenced in a comment or other config/etc, drop them
 Creating a repository in Phabricator should be as-needed instead of assumed for all Gerrit repos
* Creating a Archived repository in Phabricator should can basically all be as-needed instead of assumed for all Gerrit reposdeleted, provided they satisfy the first condition
* Archived repos can basically all be deleted, Uninstall the Gerrit-To-Phab plugin we wrote for 1:1 mapping. provided they satisfy the first conditionIt's not necessary anymore
* Uninstall the Gerrit-To-Phab plugin we wrote for 1:1 mapping. It's not necessary anymore Swap Special:Version links to using Gitiles
Also means that T183792, T115624, T179206 probably a few others can be declined.