Use bazel-made key_xor_test_app #596

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	5m 20s
build_attest_all (buildconfigs/oak_client_android_app.sh)	48m 21s
build_attest_all (buildconfigs/oak_containers_agent.sh)	11m 38s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	30m 48s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	24m 38s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	10m 21s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	23m 43s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	31m 45s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	33m 29s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	6m 14s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	6m 16s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	5m 39s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	5m 34s
build_attest_all (buildconfigs/oak_orchestrator.sh)	6m 45s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	40m 45s
build_attest_all (buildconfigs/stage0_bin.sh)	41m 31s
build_attest_all (buildconfigs/stage0_bin_tdx.sh)	41m 16s
	6h 14m 3s

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