Fix missing/wrong properties in createTestConfig

[mbg]

Extracted from #3064. Fixes some incorrect properties in createTestConfig.

Risk assessment

For internal use only. Please select the risk level of this change:

• Low risk: Changes are fully under feature flags, or have been fully tested and validated in pre-production environments and are highly observable, or are documentation or test only.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Consider adding a changelog entry for this change.
• Confirm the readme and docs have been updated if necessary.

[Copilot]

Pull Request Overview

This PR fixes inconsistencies in the createTestConfig function by adding missing properties and correcting property types to match the actual Config interface. The changes ensure the test configuration object properly reflects the structure of production configurations.

• Adds missing overlay database properties (overlayDatabaseMode and useOverlayDatabaseCaching)
• Corrects the type of dependencyCachingEnabled from boolean to CachingKind.None
• Adds explicit type casting to ensure type safety