Disable grpc_cli tests
Description
Google recently moved the location of the protobuf
repository from https://github.com/google/protobuf.git to https://github.com/protocolbuffers/protobuf.git. This had the side effect of breaking the gRPC
CMake build, because the submodule URL was pointing to the wrong place. A fix is in progress for this, but it will not propagate to older gRPC
versions, so this e2e test is broken as is.
Disable e2e tests related to grpc_cli
. In the future, we can re-enable these with an updated RELEASE_TAG
once a version with the correct submodule location is released.