Pass const char* to proto setters in Conrainers SDK #740

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	17m 15s
build_attest_all (buildconfigs/oak_client_android_app.sh)	49m 26s
build_attest_all (buildconfigs/oak_containers_agent.sh)	10m 48s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	34m 30s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	27m 21s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	23m 56s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	25m 22s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	25m 35s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	28m 6s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	18m 54s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	18m 41s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	18m 36s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	19m 19s
build_attest_all (buildconfigs/oak_orchestrator.sh)	18m 25s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	42m 27s
build_attest_all (buildconfigs/stage0_bin.sh)	42m 47s
build_attest_all (buildconfigs/stage0_bin_tdx.sh)	42m 4s
	7h 43m 32s

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