Create SAML Group Lock for SaaS

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Proposal

Available for self-managed since GitLab 15.10, create a "SAML Group Lock" for SaaS at top level group. Top level group owner should be able to have a SAML group memberships lock to prevent group members from inviting new members to subgroups that have their membership synchronized with SAML Group Links.

Edited by 🤖 GitLab Bot 🤖