Add element classes used in ee branch qa-257-group-saml-sso
What does this MR do?
Adds classes to elements used in ee branch https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/7479
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug - Conforms to the code review guidelines
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Conforms to the [merge request performance guidelines](https://docs.gitlab.com/ee/development/merge_request_performance_guidelines.html) - Conforms to the style guides
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Conforms to the database guides