Disable the unlink feature for SAML connected accounts (social login).
What does this MR do?
It disables the ability to manually unlink your SAML account, if you have one connected. In certain scenarios, the only allowed login mechanism can be SAML, and if you unlink your account you will be locked out of the system (configuration dependent).
Why was this MR needed?
See #18613 (closed)
What are the relevant issue numbers?
Fixes #18613 (closed)
Screenshots (if relevant)
When account is linked, instead of the Disconnect link, you'll see an Active note:
When no account is linked, you'll see the usual Connect link:
