We're currently performing an OIDC discovery on each FetchWorkspace.fetchDefaultWorkspace call:
https://github.com/RedHatInsights/notifications-backend/blob/master/backend/src/main/java/com/redhat/cloud/notifications/auth/rbac/workspace/WorkspaceUtils.java#L35-L38

Acceptance criteria:

• Check if it's possible to avoid some discoveries, most likely by caching data.
• If that's possible, update the implementation to lower the number of requests sent to the OIDC issuer.