front: stdcm: persist user-entered date and time in the interface #11272

Job	Run time
check_infra_schema_sync	24s
check_generated_railjson_sync	20s
check_commits	8s
build (core-build, core)	12s
build (editoast, editoast-test)	12s
check_integration_tests	1m 29s
build (gateway-test, gateway-standalone, gateway-front)	2m 44s
check_osrd_schema	36s
check_railjson_generator	1m 48s
build (front-build, front-tests, front-devel, front-nginx)	4m 10s
build (osrdyne, osrdyne-test)	24s
check_reuse_compliance	9s
check_toml	7s
Check final newline	7s
check_core	4m 7s
check_editoast_tests	4m 18s
check_editoast_lints	5m 7s
check_editoast_openapi	1m 4s
check_front_rtk_sync	1m 39s
check_gateway	2m 7s
check_osrdyne	2m 41s
check_front	2m 32s
integration_tests	19m 13s
	55m 38s

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