fix(tests): Guarantee that TripPlannerTest headsigns are different fr… #5534

Job	Run time
Build Docker image	2m 8s
Build application and assets	2m 9s
file_changes	4s
Formatting / Elixir	1m 55s
Formatting / JavaScript & TypeScript	38s
Linting / TypeScript	44s
Linting / Elixir	0s
Unit tests / JavaScript / Mocha	36s
Unit tests / JavaScript & TypeScript / Jest	1m 57s
Linting / JavaScript	23s
Linting / CSS	34s
Type checks / Elixir	1m 40s
Type checks / TypeScript	32s
Unit tests / Elixir / mix coveralls.html	1s
	13m 21s

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