Possible system email paper cuts

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This issue is a collection point for some possible system email fixes

existing issues

• Styling of code block in email notifications ca... (#524378)
• Email notification footer is collapsed in some ... (#14072 - closed)
• Incorrect fonts can be used in email notificati... (#514680)
• Add compare link to email notification for push... (#506905)
• Email notification UI and links inconsistency (#413857)
• Link to the corresponding activity feed item in... (#273608)
• Unclear if this is still a problem: Consider adding a background to diffs sent in e... (#24356)
• Mark done directly from email notifications (#21288) (I believe a URL already exists that such a button could be a link to?)
• Add unsubscribe link to plain text e-mail (#19665)
• Make the email notification title/header clickable (#18449) interesting proposal
• Please make it easier to distinguish email noti... (#17538) (It's a little unclear what the request is, but I think it maybe has to do with consistency of email subjects?)
• #17153 (comment 2074956281) (See comment thread)
• Clarify notifications for label subscriptions i... (#14486)
• possibly some fixes in public comments at Feedback issue: email notifications (#482738)

Issues that would require backend work

• GitLab status emails for a particular outage sh... (#521719)
• 500 error when following unsubscribe link in ep... (#498750)
• Email notifications for merge requests not cons... (#365766) (I think? maybe not significant BE work)
• Notifying user when mentioned in an edited comment (#118779)
• potentially requires data changes: When an issue is moved, "new issue" notificatio... (#32223)
• Base64 embedding of images in notification mails (#24179)
• Bulk editing issues I'm not already subscribed ... (#15449)
• Improve UX of pipeline failure notification emails (#456967) (data changes required to achieve requested functionality)

Maybes

• Respond to notification email with emoji (#347007)