Ensure snippets enabled in GraphQL resolver

When resolving snippets for a project, there is no need
to look up Snippets if the project snippets
feature is disabled

app/graphql/resolvers/projects/snippets_resolver.rb

@@ -10,6 +10,11 @@ module Resolvers
       def resolve(**args)
         return Snippet.none if project.nil?
 
+        unless project.feature_available?(:snippets, current_user)
+          raise Gitlab::Graphql::Errors::ResourceNotAvailable,
+            'Snippets are not enabled for this Project'
+        end
+
         super
       end
 

changelogs/unreleased/37320-ensure-project-snippet-feature-status-in-project-snippet-api-endpoi.yml

+---
+title: Project Snippets GraphQL resolver checks feature status
+merge_request: 26158
+author:
+type: performance

spec/graphql/resolvers/projects/snippets_resolver_spec.rb

@@ -75,6 +75,16 @@ describe Resolvers::Projects::SnippetsResolver do
         expect(resolve_snippets(context: { current_user: other_user }, args: { ids: project_snippet.to_global_id })).to be_empty
       end
     end
+
+    context 'when project snippets are disabled' do
+      it 'raises an error' do
+        disabled_snippet_project = create(:project, :snippets_disabled)
+        disabled_snippet_project.add_developer(current_user)
+
+        expect(SnippetsFinder).not_to receive(:new)
+        expect { resolve_snippets(obj: disabled_snippet_project) }.to raise_error(Gitlab::Graphql::Errors::ResourceNotAvailable)
+      end
+    end
   end
 
   def resolve_snippets(args: {}, context: { current_user: current_user }, obj: project)