Users can unlink Group SAML from accounts page

What

Adds badge to the profile page for unlinking Group SAML account.

Why

Needed so that users can decide when they no longer want to allow an organization to log them into GitLab.com

Screenshot

Follow up

As identified in https://gitlab.com/gitlab-org/gitlab-ee/issues/5016#note_116038252, this section of the accounts page has got to the point it needs a design refresh. It is no longer limited to social sign in and the "Click on an icon to activate" copy is confusing.

Follow up issue: TBC

Related

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/5016

Acceptance criteria / Todo

• Changelog entry added, if necessary
• Consider feature flag
• Documentation created/updated
• Tests added for this feature/bug
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer