fix(cdc): create postgres publication in Meta for cdc source job

[StrikeW]

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What's changed and what's your intention?

The patch has been tested on release-2.1:
https://buildkite.com/risingwave-test/ch-benchmark-pg-cdc-shared-source/builds/130#01939be7-f53e-45bd-bd3f-9fd24a582cef

close #19681

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