Remove duplicate struct definition

Removed duplicate definition of PublicCatalogProductPropertiesSecretManager.

Author: yfodil

api/product_catalog/v2alpha1/product_catalog_sdk.go

@@ -852,9 +852,6 @@ type PublicCatalogProductPropertiesObjectStorage struct {
 // PublicCatalogProductPropertiesSecretManager: public catalog product properties secret manager.
 type PublicCatalogProductPropertiesSecretManager struct{}
 
-// PublicCatalogProductPropertiesSecretManager: public catalog product properties secret manager.
-type PublicCatalogProductPropertiesSecretManager struct{}
-
 // PublicCatalogProductEnvironmentalImpactEstimation: public catalog product environmental impact estimation.
 type PublicCatalogProductEnvironmentalImpactEstimation struct {
 	KgCo2Equivalent *float32 `json:"kg_co2_equivalent"`