Hard delete bulk snippets

When a user deletes a Project, assume they have the
right permissions to delete its resources and trigger
a hard delete for snippets.

Changelog: fixed

app/services/projects/destroy_service.rb

@@ -72,7 +72,9 @@ module Projects
     end
 
     def remove_snippets
-      response = ::Snippets::BulkDestroyService.new(current_user, project.snippets).execute
+      # We're setting the hard_delete param because we dont need to perform the access checks within the service since
+      # the user has enough access rights to remove the project and its resources.
+      response = ::Snippets::BulkDestroyService.new(current_user, project.snippets).execute(hard_delete: true)
 
       if response.error?
         log_error("Snippet deletion failed on #{project.full_path} with the following message: #{response.message}")

spec/services/projects/destroy_service_spec.rb

@@ -437,11 +437,12 @@ RSpec.describe Projects::DestroyService, :aggregate_failures do
       destroy_project(project, user)
     end
 
-    it 'calls the bulk snippet destroy service' do
+    it 'calls the bulk snippet destroy service with the hard_delete param set to true' do
       expect(project.snippets.count).to eq 2
 
-      expect(Snippets::BulkDestroyService).to receive(:new)
-        .with(user, project.snippets).and_call_original
+      expect_next_instance_of(Snippets::BulkDestroyService, user, project.snippets) do |instance|
+        expect(instance).to receive(:execute).with(hard_delete: true).and_call_original
+      end
 
       expect do
         destroy_project(project, user)