Fix RSpec/TimecopFreeze offenses (Part 1/2)

Changelog: other

.rubocop_todo/rspec/timecop_freeze.yml

 ---
 RSpec/TimecopFreeze:
   Exclude:
-  - ee/spec/lib/gitlab/analytics/cycle_analytics/data_collector_spec.rb
-  - ee/spec/lib/gitlab/insights/reducers/count_per_period_reducer_spec.rb
   - ee/spec/models/merge_train_spec.rb
   - ee/spec/support/shared_contexts/lib/gitlab/insights/reducers/reducers_shared_contexts.rb
   - qa/spec/support/repeater_spec.rb

ee/spec/lib/gitlab/analytics/cycle_analytics/data_collector_spec.rb

@@ -12,7 +12,9 @@ RSpec.describe Gitlab::Analytics::CycleAnalytics::DataCollector do
   end
 
   around do |example|
-    Timecop.freeze(current_time) { example.run }
+    travel_to(current_time)
+    example.run
+    travel_back
   end
 
   def round_to_days(seconds)
@@ -596,13 +598,13 @@ RSpec.describe Gitlab::Analytics::CycleAnalytics::DataCollector do
       before do
         group.add_user(user, GroupMember::MAINTAINER)
 
-        travel_to(Time.new(2019, 6, 1)) do
-          mr = create(:merge_request, source_project: project1)
-          mr.metrics.update!(merged_at: 1.hour.from_now)
+        travel_to(Time.new(2019, 6, 1))
+        mr = create(:merge_request, source_project: project1)
+        mr.metrics.update!(merged_at: 1.hour.from_now)
 
-          mr = create(:merge_request, source_project: project2)
-          mr.metrics.update!(merged_at: 1.hour.from_now)
-        end
+        mr = create(:merge_request, source_project: project2)
+        mr.metrics.update!(merged_at: 1.hour.from_now)
+        travel_back
       end
 
       shared_examples 'filter examples' do

ee/spec/lib/gitlab/insights/reducers/count_per_period_reducer_spec.rb

@@ -26,7 +26,7 @@ RSpec.describe Gitlab::Insights::Reducers::CountPerPeriodReducer do
 
   context 'with no issues' do
     around do |example|
-      Timecop.freeze(Time.utc(2019, 5, 5)) { example.run }
+      travel_to(Time.utc(2019, 5, 5)) { example.run }
     end
 
     let(:project) { create(:project, :public) }
@@ -144,7 +144,7 @@ RSpec.describe Gitlab::Insights::Reducers::CountPerPeriodReducer do
         merge_request = public_send("issuable#{i}")
         merge_request_metrics_service = MergeRequestMetricsService.new(merge_request.metrics)
         Event.transaction do
-          Timecop.freeze(merge_request.created_at) do
+          travel_to(merge_request.created_at) do
             merge_event = EventCreateService.new.merge_mr(merge_request, merge_request.author)
             merge_request_metrics_service.merge(merge_event)
           end