Change set to let_it_be in ee/spec/presenters

Contributes to https://gitlab.com/gitlab-org/gitlab/issues/27922

ee/spec/presenters/approval_rule_presenter_spec.rb

@@ -3,17 +3,17 @@
 require 'spec_helper'
 
 describe ApprovalRulePresenter do
-  set(:user) { create(:user) }
-  set(:public_group) { create(:group) }
-  set(:private_group) { create(:group, :private) }
+  let_it_be(:user) { create(:user) }
+  let_it_be(:public_group) { create(:group) }
+  let_it_be(:private_group) { create(:group, :private) }
   let(:groups) { [public_group, private_group] }
 
   subject(:presenter) { described_class.new(rule, current_user: user) }
 
   describe '#approvers' do
-    set(:private_member) { create(:group_member, group: private_group) }
-    set(:public_member) { create(:group_member, group: public_group) }
-    set(:rule) { create(:approval_merge_request_rule, groups: [public_group, private_group]) }
+    let_it_be(:private_member) { create(:group_member, group: private_group) }
+    let_it_be(:public_member) { create(:group_member, group: public_group) }
+    let_it_be(:rule) { create(:approval_merge_request_rule, groups: [public_group, private_group]) }
 
     subject { presenter.approvers }
 

ee/spec/presenters/ci/pipeline_presenter_spec.rb

@@ -3,8 +3,8 @@
 require 'spec_helper'
 
 describe Ci::PipelinePresenter do
-  set(:project) { create(:project) }
-  set(:pipeline) { create(:ci_pipeline, project: project) }
+  let_it_be(:project, reload: true) { create(:project) }
+  let_it_be(:pipeline, reload: true) { create(:ci_pipeline, project: project) }
 
   subject(:presenter) do
     described_class.new(pipeline)

ee/spec/presenters/group_clusterable_presenter_spec.rb

@@ -5,7 +5,7 @@ require 'spec_helper'
 describe GroupClusterablePresenter do
   include Gitlab::Routing.url_helpers
 
-  set(:user) { create(:user) }
+  let_it_be(:user) { create(:user) }
 
   let(:presenter) { described_class.new(group) }
   let(:cluster) { create(:cluster, :provided_by_gcp, :group) }

ee/spec/presenters/projects/prometheus/alert_presenter_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 describe Projects::Prometheus::AlertPresenter do
-  set(:project) { create(:project) }
+  let_it_be(:project) { create(:project) }
 
   let(:presenter) { described_class.new(alert) }
   let(:payload) { {} }