Collect rust-related bazel constants under rust directory #261

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	4m 43s
build_attest_all (buildconfigs/oak_client_android_app.sh)	25m 10s
build_attest_all (buildconfigs/oak_containers_agent.sh)	6m 33s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	3m 53s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	9m 0s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	6m 17s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	8m 20s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	14m 46s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	17m 58s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	4m 40s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	4m 38s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	4m 56s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	5m 25s
build_attest_all (buildconfigs/oak_orchestrator.sh)	4m 33s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	5m 41s
build_attest_all (buildconfigs/stage0_bin.sh)	5m 19s
	2h 11m 52s

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