[v15] Prevent forwarded tcpip requests hanging indefinitely #50240
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The SSH channel was only being closed in the happy path once proxying of data completed. This resulted in any connections being made, and failing for any reason prior to that hanging until the user terminated the request. The behavior from the regular.Server was copied to the forward.Server to ensure that the channel is always closed when handleDirectTCPIPRequest terminates.
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codingllama
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eriktate
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Backport #50209 to branch/v15
changelog: Properly close ssh port forwarding connections to prevent requests hanging indefinitely.