Revert "Merge branch 'jk/bypass-pdm-gstg-cny' into 'master'"

What does this MR do?

Revert "Merge branch 'jk/bypass-pdm-gstg-cny' into 'master'"

This reverts merge request !3216 (merged)

It is being reverted due to BYPASS_SCHEMA_VERSION being null not working as expected.

We realized that the current embedding database schema version is much older than the codebase one, but the schema version check was not marking that as an error. It should have detected that difference, and should have errored out.

We have decided to revert this change for now, and make a new change in the CNG codebase to filter out embedding database schema. (internal slack)

related: gitlab-com/gl-infra/delivery#19688 (closed)

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