https://github.com/microsoft/dev-tunnels/pull/322 introduced a few
breaking changes:
* Port Tags were renamed to Labels
* Client construction must now provide an API version (of which there is only one)
* The /api/v1 prefix was dropped from request paths
* TunnelPortListResponses may now be paginated (but we don't support that)
* Requests to create a port with a changed protocol began erroring
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