feat(gitlab): full group retrieval #4408
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Overview
Implements full group retrieval for the GitLab connector. and adds all the mappings of GitLab access levels into group-permission suffixes.
What this PR does / why we need it
Implement fetching all groups and per-group membership from the GitLab API so Dex can return the complete set of groups for a user (not only those in the
/oauth/userinforesponse). See upstream discussion: https://gitlab.com/gitlab-org/gitlab/-/issues/340905. The filtering viagroupswill prevent overly large tokens. Full group retrieval now requires theread_apiscope.