Update Group SAML SSO settings page to specify SAML Identifier

What does this MR do and why?

Update Group SAML SSO settings page to specify SAML Identifier. Was supposed to be part of !193032 (merged).

References

• Add SCIM identities to Group SAML SSO settings ... (!193032 - merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Create a top-level group
2. Set up group_saml
3. Associate SAML and SCIM identities to a user
   • Identity.new(user_id: user_id, provider: "group_saml", saml_provider_id: provider_id, extern_uid: "0x1234").save
   • GroupScimIdentity.new(group_id: group_id, user_id: user_id, active: true, extern_uid: "0x1234").save
4. Navigate to the top-level group's SAML SSO settings page and scroll down to Members
   • Navigation: Group > Settings > SAML SSO --> Members

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