Email confirmation link for SAML/SCIM provisioned users should redirect to provider login

Release notes

Problem to solve

We enable organizations to provision users with SAML SSO and SCIM. When the account is created, a user receives an email to confirm their email address. Once they click the link, they see the GitLab login page. These users are expected to use SAML SSO to log into GitLab. It's a confusing experience for users onboarding into GitLab.

Proposal

Could we have a different link where we redirect these users to their Groups SAML login page after their email is confirmed?

Availability & Testing

What risks does this change pose to our availability?

This is a low risk feature to availability as the change would be in the generated email.

What additional test coverage or changes to tests will be needed? Ensure coverage for existing functionality for email confirmation for normal users. The updated link should only be sent to the SAML/SCIM provisioned users and not regular users.

Will it require cross-browser testing? N/A

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