core: fix max speed in concatenated envelopes #17333

Job	Run time
Check dockerfiles	16s
Build (core-build, core)	2m 33s
Check generated railjson sync	20s
Build (editoast, editoast-test)	28s
Build (gateway-test, gateway-standalone, gateway-front)	58s
Build (front-build, front-tests, front-devel, front-nginx)	32s
Check scripts	4s
Build (osrdyne, osrdyne-test)	24s
Check commits	10s
Check final newline	9s
Check integration tests	1m 22s
Check railjson generator	1m 50s
Check infra schema sync	16s
Check osrd schema	42s
Check reuse compliance	11s
Check toml	6s
Check front rtk sync	1m 4s
Check editoast tests	6m 57s
Check editoast lints	8m 30s
Check core	4m 2s
Check editoast openapi	34s
Check osrdyne	3m 50s
Check front	2m 59s
Check gateway	3m 18s
End to end tests	16m 51s
Integration tests	1m 2s
	59m 28s

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