fix: rm duplicate duplicate quotation

internal/cloud/testdata/query-json-diag/query.log

@@ -6,4 +6,4 @@
 {"@level":"info","@message":"list.concept_pet.pets: Result found","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955529+02:00","list_resource_found":{"address":"list.concept_pet.pets","display_name":"This is a charming-beagle","identity":{"id":"charming-beagle","legs":3},"resource_type":"concept_pet"},"type":"list_resource_found"}
 {"@level":"info","@message":"list.concept_pet.pets: Result found","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955535+02:00","list_resource_found":{"address":"list.concept_pet.pets","display_name":"This is a legal-lamprey","identity":{"id":"legal-lamprey","legs":2},"resource_type":"concept_pet"},"type":"list_resource_found"}
 {"@level":"info","@message":"list.concept_pet.pets: List complete","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955538+02:00","list_complete":{"address":"list.concept_pet.pets","resource_type":"concept_pet","total":5},"type":"list_complete"}
-{"@level":"warn","@message":"Warning: Something went wrong","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955540+02:00"","diagnostic":{"severity":"warning","summary":"summary","detail":"detail"},"type":"diagnostic"}
+{"@level":"warn","@message":"Warning: Something went wrong","@module":"terraform.ui","@timestamp":"2025-08-29T14:07:26.955540+02:00","diagnostic":{"severity":"warning","summary":"Warning: Something went wrong","detail":"detail"},"type":"diagnostic"}