schemas: provide a default value for ETCS brake parameters #17436

Job	Run time
Check dockerfiles	10s
Build (core-build, core)	29s
Build (editoast, editoast-test)	23s
Check commits	11s
Build (gateway-test, gateway-standalone, gateway-front)	1m 8s
Build (front-build, front-tests, front-devel, front-nginx)	35s
Build (osrdyne, osrdyne-test)	38s
Check generated railjson sync	23s
Check scripts	6s
Check railjson generator	1m 47s
Check final newline	10s
Check integration tests	1m 22s
Check osrd schema	50s
Check infra schema sync	18s
Check reuse compliance	10s
Check toml	9s
Check front rtk sync	1m 16s
Check core	4m 18s
Check editoast lints	8m 44s
Check editoast openapi	37s
Check editoast tests	6m 54s
Check gateway	3m 29s
Check osrdyne	3m 38s
Check front	3m 15s
End to end tests	17m 23s
Integration tests	1m 10s
	59m 33s

Provide feedback