Use let_it_be instead of let!

spec/models/service_spec.rb

@@ -600,15 +600,15 @@ RSpec.describe Service do
   end
 
   describe '.inherited_descendants_from_self_or_ancestors_from' do
-    let(:subgroup1) { create(:group, parent: group) }
-    let(:subgroup2) { create(:group, parent: group) }
-    let(:project1) { create(:project, group: subgroup1) }
-    let(:project2) { create(:project, group: subgroup2) }
-    let!(:group_integration) { create(:prometheus_service, group: group, project: nil) }
-    let!(:subgroup_integration1) { create(:prometheus_service, group: subgroup1, project: nil, inherit_from_id: group_integration.id) }
-    let!(:subgroup_integration2) { create(:prometheus_service, group: subgroup2, project: nil) }
-    let!(:project_integration1) { create(:prometheus_service, group: nil, project: project1, inherit_from_id: group_integration.id) }
-    let!(:project_integration2) { create(:prometheus_service, group: nil, project: project2, inherit_from_id: subgroup_integration2.id) }
+    let_it_be(:subgroup1) { create(:group, parent: group) }
+    let_it_be(:subgroup2) { create(:group, parent: group) }
+    let_it_be(:project1) { create(:project, group: subgroup1) }
+    let_it_be(:project2) { create(:project, group: subgroup2) }
+    let_it_be(:group_integration) { create(:prometheus_service, group: group, project: nil) }
+    let_it_be(:subgroup_integration1) { create(:prometheus_service, group: subgroup1, project: nil, inherit_from_id: group_integration.id) }
+    let_it_be(:subgroup_integration2) { create(:prometheus_service, group: subgroup2, project: nil) }
+    let_it_be(:project_integration1) { create(:prometheus_service, group: nil, project: project1, inherit_from_id: group_integration.id) }
+    let_it_be(:project_integration2) { create(:prometheus_service, group: nil, project: project2, inherit_from_id: subgroup_integration2.id) }
 
     it 'returns the groups and projects inheriting from integration ancestors', :aggregate_failures do
       expect(described_class.inherited_descendants_from_self_or_ancestors_from(group_integration)).to eq([subgroup_integration1, project_integration1])