feat(android.NearbyTransitPage): leave / rejoin vehicles channel after backgrounding #2788

Job	Run time
Build for Android	5m 13s
Run pre-commit to check formatting and linting	1m 14s
Run Android instrumented tests in emulator (28, default, x86)	9m 32s
Test for Android	6m 17s
Upload to Google Play	0s
	22m 16s

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