editoast: improve naming of extracted variables in several handlers #10116

Job	Run time
check_commits	5s
check_railjson_generator	1m 47s
check_generated_railjson_sync	24s
build (core-build, core)	12s
check_integration_tests	1m 24s
build (editoast, editoast-test)	3m 43s
check_osrd_schema	40s
build (gateway-test, gateway-standalone, gateway-front)	5m 3s
Check final newline	6s
build (front-build, front-tests, front-devel, front-nginx)	18s
build (osrdyne, osrdyne-test)	25s
check_infra_schema_sync	17s
check_toml	5s
check_front_rtk_sync	1m 41s
check_core	4m 6s
check_front	2m 43s
check_gateway	2m 8s
check_editoast_tests	4m 4s
check_osrdyne	2m 36s
integration_tests	5m 36s
check_editoast_lints	5m 7s
check_editoast_openapi	1m 14s
	43m 44s

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