Draft: Add OTEL gitlab oidc auth extension
- Adds gitlab oidc OTEL extension to be bundled in observability collector
- Keeps the same core logic for authentication in use by
auth-proxy - Puts
namespaceID,projectIDandtenantIDin client auth data to be used by downstream processor.
Closes #2973 (closed).
Related to #2955 (closed).
Edited by Arun Sori