Replace set to let_it_be in spec/presenters

Get rid of set in specs

spec/presenters/ci/bridge_presenter_spec.rb

@@ -3,9 +3,9 @@
 require 'spec_helper'
 
 describe Ci::BridgePresenter do
-  set(:project) { create(:project) }
-  set(:pipeline) { create(:ci_pipeline, project: project) }
-  set(:bridge) { create(:ci_bridge, pipeline: pipeline, status: :failed) }
+  let_it_be(:project) { create(:project) }
+  let_it_be(:pipeline) { create(:ci_pipeline, project: project) }
+  let_it_be(:bridge) { create(:ci_bridge, pipeline: pipeline, status: :failed) }
 
   subject(:presenter) do
     described_class.new(bridge)

spec/presenters/ci/trigger_presenter_spec.rb

@@ -3,10 +3,10 @@
 require 'spec_helper'
 
 describe Ci::TriggerPresenter do
-  set(:user) { create(:user) }
-  set(:project) { create(:project) }
+  let_it_be(:user) { create(:user) }
+  let_it_be(:project) { create(:project) }
 
-  set(:trigger) do
+  let_it_be(:trigger) do
     create(:ci_trigger, token: '123456789abcd', project: project)
   end
 

spec/presenters/event_presenter_spec.rb

@@ -5,11 +5,11 @@ require 'spec_helper'
 describe EventPresenter do
   include Gitlab::Routing.url_helpers
 
-  set(:group) { create(:group) }
-  set(:project) { create(:project, group: group) }
-  set(:target) { create(:milestone, project: project) }
-  set(:group_event) { create(:event, :created, project: nil, group: group, target: target) }
-  set(:project_event) { create(:event, :created, project: project, target: target) }
+  let_it_be(:group) { create(:group) }
+  let_it_be(:project) { create(:project, group: group) }
+  let_it_be(:target) { create(:milestone, project: project) }
+  let_it_be(:group_event) { create(:event, :created, project: nil, group: group, target: target) }
+  let_it_be(:project_event) { create(:event, :created, project: project, target: target) }
 
   describe '#resource_parent_name' do
     context 'with group event' do

spec/presenters/label_presenter_spec.rb

@@ -5,8 +5,8 @@ require 'spec_helper'
 describe LabelPresenter do
   include Gitlab::Routing.url_helpers
 
-  set(:group) { create(:group) }
-  set(:project) { create(:project, group: group) }
+  let_it_be(:group) { create(:group) }
+  let_it_be(:project) { create(:project, group: group) }
   let(:label) { build_stubbed(:label, project: project).present(issuable_subject: project) }
   let(:group_label) { build_stubbed(:group_label, group: group).present(issuable_subject: project) }