fix: schema selection at connection time

[gsalingu]

1. Description
   Fix the schema selection issue encountered with postgresql 16

2. Related issues
   CDS database engine does not account for schema parameter #7197

3. About tests
   Ran locally following the official setup routine: https://ovh.github.io/cds/hosting/ready-to-run/from-binaries/#prepare-database

It fixed the then failing step: https://ovh.github.io/cds/hosting/ready-to-run/from-binaries/#prepare-database

@ovh/cds

[ovh-cds]

CDS Report build-cds#22057.0 ✔
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[ovh-cds]

CDS Report integration-cds#22057.0 ✘

• Integration
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  • Standalone Tests v1 ✔
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[ovh-cds]

CDS Report integration-cds#22057.1 ✘

• Integration
  • Docker Compose Tests ✔
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  • Standalone Tests v1 ✔
  • Standalone Tests v2 ✘