Cannot delete label identifier associated field

[Weiko]

Context

An object should always have a labelIdentifier (would be its primary key at least). If the associated field is deleted by a user, it will break the app. Ideally we should handle that on the DB level but we don't have a FK for this column yet.
In the meantime I'm adding the validation check in the backend, note that this is already handle on the FE side since the "archive/delete" buttons don't appear for such fields so you need to reassign it to another field first which is the desired behaviour.

[greptile-apps]

PR Summary

• Added validation in packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts to prevent deletion of label identifier-associated fields
• Throws FieldMetadataException if deletion is attempted without reassigning the label identifier field

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