Backport of connect: enable setting connect upstream destination namespace into release/1.2.x #13133
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Backport
This PR is auto-generated from #13125 to be assessed for backporting due to the inclusion of the label backport/1.2.x.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
This PR enables setting
destination_namespace
for a Connect proxy upstream.