test: Consolidate Web UI tests and fix async execution #1955

Job	Run time
Build (Unit-tests & Android-Lint)	2h 41m 26s
Android UI-tests on emulator (24, default)	10m 5s
Android UI-tests on emulator (23, default)	10m 49s
Android UI-tests on emulator (27, default)	9m 23s
Android UI-tests on emulator (33, default)	9m 10s
Android UI-tests on emulator (29, default)	11m 25s
Android UI-tests on emulator (31, default)	9m 3s
Android UI-tests on emulator (25, default)	9m 10s
Android UI-tests on emulator (36, default)	10m 30s
Android UI-tests on emulator (26, default)	9m 4s
Android UI-tests on emulator (32, default)	9m 42s
Android UI-tests on emulator (28, default)	9m 56s
Android UI-tests on emulator (34, default)	9m 28s
Android UI-tests on emulator (35, default)	12m 22s
Android UI-tests on emulator (30, default)	8m 42s
	5h 0m 15s

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