Remove wrapping layer around example gRPC client #729

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	17m 44s
build_attest_all (buildconfigs/oak_client_android_app.sh)	50m 49s
build_attest_all (buildconfigs/oak_containers_agent.sh)	11m 51s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	34m 0s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	27m 8s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	23m 33s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	25m 11s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	26m 12s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	27m 38s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	17m 14s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	18m 32s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	17m 44s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	18m 23s
build_attest_all (buildconfigs/oak_orchestrator.sh)	18m 9s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	44m 50s
build_attest_all (buildconfigs/stage0_bin.sh)	42m 36s
build_attest_all (buildconfigs/stage0_bin_tdx.sh)	41m 34s
	7h 43m 8s

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