Merge branch '417860-update-buttons' into 'master'

Update SAML buttons to pajamas

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/126605



Merged-by: Rajendra Kadam <rkadam@gitlab.com>
Approved-by: Malcolm Locke <mlocke@gitlab.com>
Approved-by: Rajendra Kadam <rkadam@gitlab.com>
Reviewed-by: Alexander Turinske <aturinske@gitlab.com>
Reviewed-by: Malcolm Locke <mlocke@gitlab.com>
Co-authored-by: Alexander Turinske <aturinske@gitlab.com>