Clean up (use of) McpException and McpTransportException (#321) #60

Job	Run time
build (windows-latest, Debug)	5m 23s
build (windows-latest, Release)	5m 23s
build (ubuntu-latest, Release)	2m 23s
build (macos-latest, Release)	1m 22s
build (ubuntu-latest, Debug)	2m 13s
build (macos-latest, Debug)	1m 21s
publish-coverage / publish-coverage	37s
	18m 42s

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