tests/emulator, .github/workflows/emulator: add #48

Job	Run time
emulate (29, bootstrap_flakes)	12m 18s
emulate (29, bootstrap_channels)	7m 24s
emulate (29, poke_around)	8m 2s
emulate (29, test_channels_uiautomator)	13m 16s
emulate (29, test_channels_shell)	14m 12s
emulate (34, bootstrap_flakes)	10m 11s
emulate (34, bootstrap_channels)	6m 8s
emulate (34, poke_around)	7m 24s
emulate (34, test_channels_uiautomator)	10m 47s
emulate (34, test_channels_shell)	7m 19s
	1h 37m 1s

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