Remove `group_user_saml` feature flag
What does this MR do and why?
Remove group_user_saml
feature flag
group_user_saml
was never enabled or used. We have found we don't want
to pursue this path so we are removing it.
Changelog: other (Changelog was mandatory for this MR. I chose other
because removal
didn't seem right as it was never released)
Closes #434464 (comment 1865794303)
MR acceptance checklist
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Screenshots or screen recordings
N/A
How to set up and validate locally
Inviting SAML user to groups and projects should work as before.
Edited by Eduardo Sanz García