Add support for search results for posts

Extended the search functionality to include results for posts. Updated `SearchResultsType` and related types to handle `posts`, adding a new `SearchPostsResultsType` with `uuid`, `name`, and `slug`. Adjusted mutations to populate posts in the search response.

core/graphene/mutations.py

@@ -493,5 +493,6 @@ class Search(BaseMutation):
                 products=data["products"],
                 categories=data["categories"],
                 brands=data["brands"],
+                posts=data["posts"],
             )
         )

core/graphene/object_types.py

@@ -454,19 +454,29 @@ class LanguageType(ObjectType):
 class SearchProductsResultsType(ObjectType):
     uuid = UUID()
     name = String()
+    slug = String()
 
 
 class SearchCategoriesResultsType(ObjectType):
     uuid = UUID()
     name = String()
+    slug = String()
 
 
 class SearchBrandsResultsType(ObjectType):
     uuid = UUID()
     name = String()
+    slug = String()
+
+
+class SearchPostsResultsType(ObjectType):
+    uuid = UUID()
+    name = String()
+    slug = String()
 
 
 class SearchResultsType(ObjectType):
     products = List(description=_("products search results"), of_type=SearchProductsResultsType)
     categories = List(description=_("products search results"), of_type=SearchCategoriesResultsType)
     brands = List(description=_("products search results"), of_type=SearchBrandsResultsType)
+    posts = List(description=_("posts search results"), of_type=SearchPostsResultsType)