AO3-6307 Add mailer previews for creatorship notifications #4292
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Issue
https://otwarchive.atlassian.net/browse/AO3-6307
Purpose
Enable mailer previews in development and staging.
I18n.with_locale
block outside the mailer methods.Simplify factory_bot setup.
Testing Instructions
The preview UI should be at https://test.archiveofourown.org/rails/mailers.