Add stubs for predicate type and claim landing pages. #456

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	4m 3s
build_attest_all (buildconfigs/oak_client_android_app.sh)	48m 59s
build_attest_all (buildconfigs/oak_containers_agent.sh)	6m 51s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	28m 50s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	8m 19s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	6m 6s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	7m 16s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	14m 30s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	16m 51s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	4m 8s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	4m 6s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	4m 9s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	4m 6s
build_attest_all (buildconfigs/oak_orchestrator.sh)	3m 55s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	17m 27s
build_attest_all (buildconfigs/stage0_bin.sh)	39m 36s
	3h 39m 12s

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