Convert profile SAML provider buttons to pajamas compliant buttons

From MR suggestions:

From a quick search, it seems the only place these styles are needed is in ee/app/views/profiles/accounts/_group_saml_unlink_buttons.html.haml (and maybe app/views/profiles/accounts/_providers.html.haml). It would be nice to add a comment here and (in a follow-up) find a way to get rid if most of them.

Seems like we should be using Pajamas buttons instead of these custom styles, so migrating to the ButtonComponent sounds like a win here.

Problem to solve

Custom CSS is only used in this one area, and could be removed / replaced with a standard pajamas compliant button.

Proposal

Remove styles from app/assets/stylesheets/page_bundles/profile.scss such as .provider-btn-group and replace with standard component.

added typemaintenance label

mentioned in merge request !145197 (merged)

changed title from Convert profile SAML buttons to pajamas compliant buttons to Convert profile SAML provider buttons to pajamas compliant buttons

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added groupauthentication label

added devopsgovern sectionsec labels