Seed morph metadata (#14149)

in thie PR we create the tooling to allow the relation and morph
relation creation during the seed process.

We use the ObjectMetadataMaps in order to fasten the process

Fixes https://github.com/twentyhq/core-team-issues/issues/1179

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/from-cached-field-metadata-entity-to-flat-field-metadata.util.ts

@@ -83,6 +83,10 @@ export const fromCachedFieldMetadataEntityToFlatFieldMetadata = <
       !isCachedFieldMetadataEntityOfType(
         relationTargetCachedFieldMetadata,
         FieldMetadataType.RELATION,
+      ) &&
+      !isCachedFieldMetadataEntityOfType(
+        relationTargetCachedFieldMetadata,
+        FieldMetadataType.MORPH_RELATION,
       )
     ) {
       throw new WorkspaceMetadataCacheException(