front: add switch for paced train #18978

Job	Run time
Check dockerfiles	8s
Check scripts	3s
Check commits	10s
Build (core-build, core)	14s
Check final newline	46s
Build (editoast, editoast-test)	13s
Check generated railjson sync	22s
Build (gateway-test, gateway-standalone, gateway-front)	2m 5s
Build (front-tests)	2m 35s
Check railjson generator	1m 46s
Build (osrdyne, osrdyne-test)	15s
Check infra schema sync	13s
Check integration tests	1m 20s
Check osrd schema	42s
Check reuse compliance	9s
Check toml	4s
Check editoast lints	8m 21s
Check editoast tests	6m 39s
Check core	4m 3s
Check editoast openapi	42s
Check front	3m 7s
Check front rtk sync	1m 12s
Check gateway	3m 19s
Check osrdyne	3m 35s
End to end tests	8m 14s
Integration tests	1m 4s
	51m 21s

Provide feedback