front: fix undefined markerInfo.op in ItineraryMarkers #19284

Job	Run time
Build (core-build, core)	27s
Check dockerfiles	14s
Build (editoast, editoast-test)	13s
Check generated railjson sync	24s
Build (gateway-test, gateway-standalone, gateway-front)	3m 0s
Build (front-tests)	2m 45s
Build (osrdyne, osrdyne-test)	17s
Check scripts	7s
Check commits	11s
Check railjson generator	2m 16s
Check final newline	14s
Check infra schema sync	18s
Check integration tests	1m 24s
Check osrd schema	41s
Check toml	4s
Check reuse compliance	10s
Check front rtk sync	1m 10s
Check editoast openapi	47s
Check core	4m 23s
Check editoast lints	8m 40s
Check editoast tests	7m 24s
Check gateway	3m 20s
Check front	3m 1s
Check osrdyne	3m 40s
End to end tests	8m 17s
Integration tests	1m 8s
	54m 35s

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