feat: new relation schema generation (#9882)

Fix https://github.com/twentyhq/core-team-issues/issues/295

Based on the feature-flag `IsNewRelationEnabled` the schema will be
marked as outdated and regenerated, this will cause an error on the
front-end on the first request on the following ones schema will be well
generated ans request will work.

packages/twenty-server/src/engine/utils/is-relation-field-metadata.util.ts

@@ -0,0 +1,9 @@
+import { FieldMetadataType } from 'twenty-shared';
+
+import { FieldMetadataInterface } from 'src/engine/metadata-modules/field-metadata/interfaces/field-metadata.interface';
+
+export const isRelationFieldMetadata = (
+  fieldMetadata: FieldMetadataInterface<'default' | FieldMetadataType.RELATION>,
+): fieldMetadata is FieldMetadataInterface<FieldMetadataType.RELATION> => {
+  return fieldMetadata.type === FieldMetadataType.RELATION;
+};