Un-quarantine group_saml_non_enforced_sso_spec e2e spec

What does this MR do?

Un-quarantines group_saml_non_enforced_sso_spec spec. The bug is supposed to be fixed in !28646 (merged)

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content