chore(kong): set postgres default image repository, name and tag to ''
#1400
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What this PR does / why we need it:
This PR removes the defaults for postgres image, tag and repo which is a consequence of bitnami/containers#83267.
From now on users will have to provide these value by themselves or use an externally managed postgres instances (as described in the guide https://developer.konghq.com/gateway/install/kubernetes/on-prem/#postgres-database).
Special notes for your reviewer:
Checklist
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mainbranch.