Detach captured backend and profile values

internal/domain/smoke_diagnostics.go

@@ -122,15 +122,11 @@ const (
 )
 
 // CloneBackend returns a copy of a backend, including its mutable settings.
-func CloneBackend(backend Backend) (Backend, error) {
+func CloneBackend(backend Backend) Backend {
 	cloned := backend
-	var err error
-	cloned.ExtraParams, err = jsonvalue.CopyMap(backend.ExtraParams)
-	if err != nil {
-		return Backend{}, err
-	}
+	cloned.ExtraParams = jsonvalue.CloneTrusted(backend.ExtraParams).(map[string]any)
 	cloned.SmokeTests = CloneBackendSmokeTestConfig(backend.SmokeTests)
-	return cloned, nil
+	return cloned
 }
 
 // CloneBackendSmokeTestConfig returns an independent copy of optional metadata.