Update mock creation to use established style

ee/spec/lib/ee/gitlab/usage_data_spec.rb

@@ -347,7 +347,8 @@ describe Gitlab::UsageData do
             let_it_be(:user) { create(:user, group_view: :security_dashboard) }
 
             before do
-              Timecop.travel 2.days.ago do
+              [29, 2].each do |n|
+                Timecop.travel n.days.ago do
                   create(:ci_build, name: 'container_scanning', user: user)
                   create(:ci_build, name: 'dast', user: user)
                   create(:ci_build, name: 'dependency_scanning', user: user)
@@ -355,6 +356,7 @@ describe Gitlab::UsageData do
                   create(:ci_build, name: 'sast', user: user)
                 end
               end
+            end
 
             it 'includes accurate usage_activity_by_stage data' do
               expect(described_class.uncached_data[:usage_activity_by_stage_monthly][:secure]).to eq(
@@ -368,9 +370,11 @@ describe Gitlab::UsageData do
             end
 
             it 'combines license_scanning into license_management' do
-              Timecop.travel 2.days.ago do
+              [29, 2].each do |n|
+                Timecop.travel n.days.ago do
                   create(:ci_build, name: 'license_scanning', user: user)
                 end
+              end
 
               expect(described_class.uncached_data[:usage_activity_by_stage_monthly][:secure]).to eq(
                 user_preferences_group_overview_security_dashboard: 1,