lmr: add mandatory fields and error messages to the form #17031

Job	Run time
Build (core-build, core)	25s
Check generated railjson sync	20s
Check dockerfiles	13s
Build (editoast, editoast-test)	17s
Build (gateway-test, gateway-standalone, gateway-front)	2m 9s
Check scripts	4s
Build (front-build, front-tests, front-devel, front-nginx)	2m 26s
Check commits	9s
Build (osrdyne, osrdyne-test)	21s
Check railjson generator	1m 54s
Check final newline	11s
Check integration tests	1m 29s
Check osrd schema	50s
Check toml	9s
Check infra schema sync	19s
Check reuse compliance	12s
Check editoast tests	6m 43s
Check front rtk sync	1m 16s
Check core	4m 3s
Check editoast lints	8m 32s
Check editoast openapi	44s
Check front	3m 13s
Check gateway	3m 32s
Check osrdyne	3m 48s
End to end tests	15m 1s
Integration tests	1m 11s
	59m 31s

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