fix: can not connect to a CockroachDB instance when cluster and manager belong different namespace

[ericmoi]

fix: cant connect to a CockroachDB instance when cluster and manager belong different namespace

I scale down the crdb cluster on my loclal kubernetes, manager can not connect to a CockroachDB instance when cluster and manager belong different namespace

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• [ ] I have added these changes to the changelog (or it's not applicable).

[cockroach-teamcity]

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