Remove obsolete code branch

ee/app/finders/productivity_analytics_finder.rb

@@ -37,26 +37,10 @@ class ProductivityAnalyticsFinder < MergeRequestsFinder
     return items unless params[:merged_at_after] || params[:merged_at_before]
 
     items = items.joins(:metrics)
-    items = items.where(metrics_table[:merged_at].gteq(merged_at_between[:from])) if merged_at_between[:from]
-    items = items.where(metrics_table[:merged_at].lteq(merged_at_between[:to])) if merged_at_between[:to]
+    items = items.where(metrics_table[:merged_at].gteq(params[:merged_at_after])) if params[:merged_at_after]
+    items = items.where(metrics_table[:merged_at].lteq(params[:merged_at_before])) if params[:merged_at_before]
 
     items
   end
   # rubocop: enable CodeReuse/ActiveRecord
-
-  def merged_at_between
-    @merged_at_between ||= begin
-      if merged_at_period
-        { from: Time.zone.now.ago(merged_at_period.days) }
-      else
-        { from: params[:merged_at_after], to: params[:merged_at_before] }
-      end
-    end
-  end
-
-  def merged_at_period
-    matches = params[:merged_at_after]&.match(/^(?<days>\d+)days?$/)
-
-    matches && matches[:days].to_i
-  end
 end

ee/spec/finders/productivity_analytics_finder_spec.rb

@@ -62,20 +62,6 @@ describe ProductivityAnalyticsFinder do
         end
       end
 
-      context 'with merged_at_after specified as days-range' do
-        let(:search_params) do
-          {
-            merged_at_after: '11days'
-          }
-        end
-
-        it 'returns all MRs with merged date later than Xdays ago' do
-          long_mr
-          short_mr
-          expect(subject.execute).to match_array([long_mr])
-        end
-      end
-
       context 'with merged_at_after and merged_at_before specified' do
         let(:search_params) do
           {