Merge branch '44790-disabled-emails-logging' into 'master'

Stop logging email information when emails are disabled

Closes #44790

See merge request gitlab-org/gitlab-ce!18521

changelogs/unreleased/44790-disabled-emails-logging.yml

+---
+title: Stop logging email information when emails are disabled
+merge_request: 18521
+author: Marc Shaw
+type: fixed

config/initializers/disable_email_interceptor.rb

 # Interceptor in lib/disable_email_interceptor.rb
-ActionMailer::Base.register_interceptor(DisableEmailInterceptor) unless Gitlab.config.gitlab.email_enabled
+unless Gitlab.config.gitlab.email_enabled
+  ActionMailer::Base.register_interceptor(DisableEmailInterceptor)
+  ActionMailer::Base.logger = nil
+end