Update GSTG-CNY to have sec db configuration override

What does this MR do?

Previously we merged a partial configuration for GPRD-CNY to point to the sec database cluster. This had the unintended side effect of breaking db load balancing for main and ci, causing all CNY traffic to hit the primary databases.

We're still testing the final rollout phases for sec decomp, but given this will be an issue in GPRD, this MR applies the entire CNY configuration override (including main and ci databases) to preserve db load balancing so we do not run the risk of unneccessary traffic hitting main/ci primaries during the CR execution.

Author Check-list

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Applier Check-list

• Make sure there is no ongoing deployment for the affected envs before merging (see #announcements slack channel)

Closes #0418