scripts: make all scripts that need it use realpath #14080

Job	Run time
build (core-build, core)	18s
check_railjson_generator	2m 18s
build (editoast, editoast-test)	13s
build (gateway-test, gateway-standalone, gateway-front)	1m 15s
build (front-build, front-tests, front-devel, front-nginx)	15s
check_commits	9s
build (osrdyne, osrdyne-test)	26s
check_generated_railjson_sync	27s
Check final newline	7s
check_infra_schema_sync	19s
check_integration_tests	1m 24s
check_osrd_schema	37s
check_toml	9s
check_reuse_compliance	8s
check_front_rtk_sync	1m 32s
check_editoast_openapi	57s
check_core	4m 4s
check_editoast_lints	9m 9s
check_editoast_tests	6m 19s
check_gateway	3m 24s
check_osrdyne	3m 38s
check_front	2m 23s
integration_tests	11m 52s
	51m 23s

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