Make ClientTransportClosedException public and unify transport except… #2573

Job	Run time
build (macos-latest, Debug)	5m 48s
build (windows-latest, Release)	12m 13s
build (ubuntu-latest, Debug)	14m 10s
build (macos-latest, Release)	6m 59s
build (ubuntu-latest, Release)	13m 27s
build (windows-latest, Debug)	12m 15s
publish-coverage	0s
	1h 4m 52s

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