What does this MR do and why?

In MR Add optional SAML Auth requirement for MR approval (!130204 - merged) we are adding the ability to use SAML auth (if it is enabled) to approve MRs. Previously it was only possible to use password auth. This feature is currently on for gitlab.com, instance level SAML will be built next in this issue SAML SSO authentication for merge request appro... (#431415 - closed)

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