editoast: populate InternalError status/context when unparsable #8699

Job	Run time
check_generated_railjson_sync	21s
check_commits	7s
check_infra_schema_sync	20s
build (core-build, core)	14s
build (editoast, editoast-test)	4m 59s
check_integration_tests	1m 37s
check_osrd_schema	1m 0s
build (gateway-test, gateway-standalone, gateway-front)	1m 29s
check_railjson_generator	1m 55s
build (front-build, front-tests, front-devel, front-nginx)	20s
check_toml	8s
Check final newline	7s
check_editoast_tests	5m 53s
check_editoast_openapi	1m 24s
check_core	4m 7s
check_editoast_lints	5m 1s
check_front_rtk_sync	1m 33s
check_gateway	2m 12s
check_front	2m 46s
integration_tests	6m 14s
	41m 47s

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