Update Remote Workers API protobufs

google/devtools/remoteworkers/v1test2/bots.proto

google/devtools/remoteworkers/v1test2/bots_pb2.py

google/devtools/remoteworkers/v1test2/command.proto

google/devtools/remoteworkers/v1test2/command_pb2.py

google/devtools/remoteworkers/v1test2/tasks.proto

google/devtools/remoteworkers/v1test2/tasks_pb2_grpc.py

google/devtools/remoteworkers/v1test2/worker.proto

google/devtools/remoteworkers/v1test2/worker_pb2.py