refactor: Convert itinerary legs to segments for easier rendering #5436

Job	Run time
file_changes	5s
Build Docker image	5m 49s
Build application and assets	5m 50s
Linting / Elixir	3m 40s
Linting / JavaScript	24s
Unit tests / JavaScript / Mocha	35s
Linting / TypeScript	35s
Unit tests / JavaScript & TypeScript / Jest	2m 14s
Linting / CSS	34s
Type checks / Elixir	3m 55s
Formatting / Elixir	3m 11s
Formatting / JavaScript & TypeScript	39s
Type checks / TypeScript	41s
Unit tests / Elixir / mix coveralls.html	1s
	28m 13s

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