Make ClientTransportClosedException public and unify transport exception handling #2559

Job	Run time
build (macos-latest, Debug)	5m 4s
build (macos-latest, Release)	6m 32s
build (ubuntu-latest, Release)	13m 57s
build (ubuntu-latest, Debug)	12m 43s
build (windows-latest, Debug)	11m 43s
build (windows-latest, Release)	12m 46s
publish-coverage	0s
	1h 2m 45s

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