Since we have swapped to the kessel-sdk, we should use the available authentication for all our internal inventory endpoints for RBAC. 

A guide on how to do so can be found at https://project-kessel.github.io/docs/building-with-kessel/how-to/authenticate-with-python-sdk/

Mainly following the section on Using OAuth Credentials with gRPC as it is what we are using and we have the required service accounts already generated for each environment.