Agent check gRPC version against server

[6543]

close #1114

As long as the VersionResponse type is not changed the check will fail/pass gracefully

example output:

{"level":"error","error":"GRPC version mismatch","time":"2023-03-19T19:49:09+01:00","message":"Server version next-6923e7ab does report grpc version 2 but we only understand 1"}
GRPC version mismatch

[6543]

@lafriks added a deletion nit and code comments ...