Fix wrong uuid error on field metadata (#18598)

## Summary
- Same fix as #18590 but applied to `FieldMetadataDTO`
- Changed `universalIdentifier` from `UUID` to `String` type since field
metadata universal identifiers are not necessarily valid UUIDs
- Removed `universalIdentifier` from `FieldFilter` (was using
`UUIDFilterComparison`)
- Updated generated SDK and frontend types accordingly

packages/twenty-server/src/engine/metadata-modules/field-metadata/dtos/field-metadata.dto.ts

@@ -64,9 +64,8 @@ export class FieldMetadataDTO<T extends FieldMetadataType = FieldMetadataType> {
   @IDField(() => UUIDScalarType)
   id: string;
 
-  @IsUUID()
   @IsNotEmpty()
-  @IDField(() => UUIDScalarType)
+  @Field()
   universalIdentifier: string;
 
   @IsEnum(FieldMetadataType)