* added primary-email-check page, route and controllers
* add `#add-email` internal link in settings to display new email form
* added primary-email-check redirection with split test
* update `lastPrimaryEmailCheck` when the default email address is set
* added `lastPrimaryCheck` to admin panel
* translations for primary-email-check
* acceptance tests for primary-email-check
* [web] multi-submit for primary email check
* Using `confirmedAt` to prevent from displaying primary-email-check page
Co-authored-by: Jakob Ackermann <jakob.ackermann@overleaf.com>
Co-Authored-By: Miguel Serrano <mserranom@gmail.com>
GitOrigin-RevId: d8e3a280439da08038a4487d8bfd7b3b0596e3b5
