refactor(mission_planner): add comment functions/remove unused stuff/add comment #25297

Job	Run time
prevent-no-label-execution / prevent-no-label-execution	1s
build-and-test-differential (humble)	58m 3s
build-and-test-differential (humble, -cuda)	1h 0m 51s
clang-tidy-differential	21s
	1h 59m 16s

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