Aliases are not tied to JMAP identities

[thundernest-bot]

Describe the bug

When an email alias is deleted on the Thundermail dashboard, it remains selectable in the Webmail "From" address dropdown.

To Reproduce

Steps to reproduce the behavior:

1. Go to accounts.tb.pro
2. Delete an existing alias (e.g., name@tb.pro)
3. Navigate to 'Webmail' and click 'New Message'
4. Click on the 'From' selection dropdown
5. See that the deleted alias is still available as a sender option

Expected behavior

Deleting an alias should automatically remove it from the Webmail "From" selection menu.

Actual behavior

The deleted alias remains selectable in the "From" menu. Sending mail to the deleted alias fails with a "not found" error until the alias is restored.

(created from Zendesk ticket #8399)
gz#8399

gz#8686

(related to Zendesk ticket #8686)