release-22.2: changefeedccl: fix kafka external connections #98680
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Fixes #98679.
The flow for external connection sinks in 22.2.6 ends up calling .Dial() twice, which causes the Kafka sink to hang on Close. This is fixed by more elaborate
refactors in the current version but this is a simple targeted fix for backporting only.
Release note (enterprise change): Fixed a bug preventing the creation of changefeeds to external:// URIs.
Release justification: Low-impact bug fix.