Remove GRPC Clients and Configs

[joneubank]

We have removed all GRPC dependencies from the program service and from Ego, so now we want to remove those from the platform API. In particular the code that established the GRPC connection needs to be removed.

There is GRPC code written for Ego and for Program Service - all of it should be removed.

Detailed Description

• Remove Program Service GRPC client
• Remove any code creating GRPC connection to Program Service
• Remove config variables related to GRPC
• Remove Ego GRPC client code

[demariadaniel]

#714