Add support for noreply bot emails

On Github, there is a case where noreply bot email accounts are used as part of workflows that cannot, from initial investigation from the reporting user eclipsefdn/helpdesk#2764 (comment 1088876), be disabled. The current workaround used by the project is to create an Eclipse account and sign an invalid ECA to mitigate the issue, which isn't ideal as it breaks some of our rules around who can/can't sign agreements.

Logic already exists to do conversions for Github handles to noreply emails, and we technically have access to the bots user through the noreply. We can then reverse the mapping to pull the user and use that to lookup bot accounts in cases of no reply for better accuracy in these edge cases.