Refine twenty-orm 'object metadata not found' issue

[charlesBochet]

Twenty ORM sometimes does not find corresponding object metadata in memory. This PR adds a bit more log to understand where the issue could come from

[greptile-apps]

PR Summary

Enhanced error handling and refactoring in workspace.repository.ts to improve object metadata retrieval and maintainability.

• Updated isPlainObject import to @nestjs/common/utils/shared.utils.
• Enhanced error messages in getObjectMetadataFromTarget for missing metadata.
• Refactored getCompositeFieldMetadata to getCompositeFieldMetadataCollection with objectMetadata parameter.
• Improved code readability and separation of concerns.

Thorough testing is recommended to validate the new error handling logic.

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