feat(TripPlanner.ResultsSummary): make it a live region (#2318) #5645

Job	Run time
Build Docker image	1m 54s
file_changes	5s
Build application and assets	1m 54s
Formatting / JavaScript & TypeScript	29s
Linting / Elixir	0s
Formatting / Elixir	1m 42s
Linting / TypeScript	45s
Unit tests / JavaScript / Mocha	37s
Unit tests / JavaScript & TypeScript / Jest	1m 41s
Linting / CSS	35s
Linting / JavaScript	31s
Type checks / Elixir	1m 27s
Type checks / TypeScript	32s
Unit tests / Elixir / mix coveralls.html	1s
	12m 13s

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