Support reverse tunnel connections in DTS

[tcibinan]

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Background

Support for autonomous data synchronisation was introduced in DTS via #2044. It allows DTS to autonomously transfer data to Cloud Pipeline even if there is no direct network connection from Cloud Pipeline to DTS.

Approach

Nevertheless autonomous data synchronisation triggers data transfers only from within DTS itself and not from Cloud Pipeline. In order to trigger data transfers from Cloud Pipeline to DTS without direct network connections a reverse tunnel connection approach can be used. See #2587 to find out more about reverse tunnel connection implementation in pipe cli.