This pr upgrades oidc to v3 . Function signature changes have been migrated as well. Specifically there are more client calls that take a context now. Where feasable a context is added to those calls. Where a context is not (easily) available context.TODO() is used as a reminder for when it does.
Related to #6619
Add functionality to configure the access token type on the service accounts to provide the oidc library with the necessary information to create the right type of access token.
Request an access_token for service users with OAuth 2.0 Client Credentials Grant. Added functionality to generate and remove a secret on service users.