Undo UART looping changes for now #829

Job	Run time
tests (ubuntu-latest, tests)	40s
build (ubuntu-latest, noradio)	2m 8s
tests (macos-latest, tests)	31s
build (ubuntu-latest, wifi)	2m 19s
tests (windows-latest, tests_nosan)	1m 43s
build (ubuntu-latest, bt)	2m 14s
build (macos-latest, noradio)	1m 30s
build (macos-latest, wifi)	2m 30s
build (macos-latest, bt)	2m 1s
build (windows-latest, noradio)	5m 40s
build (windows-latest, wifi)	6m 14s
build (windows-latest, bt)	5m 28s
	32m 58s

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