Add reusable pathItems to components

Author: MaggieKimani1

src/Microsoft.OpenApi/Services/CopyReferences.cs

@@ -74,6 +74,12 @@ public override void Visit(IOpenApiReferenceable referenceable)
             case OpenApiSecurityScheme securityScheme:
                 AddSecuritySchemeToComponents(securityScheme);
                 break;
+            case OpenApiPathItemReference openApiPathItemReference:
+                AddPathItemToComponents(openApiPathItemReference.Target, openApiPathItemReference.Reference.Id);
+                break;
+            case OpenApiPathItem pathItem:
+                AddPathItemToComponents(pathItem);
+                break;
             default:
                 break;
         }