Remove duplicate feature spec for filtering issues by no milestone

spec/features/issues_spec.rb

@@ -92,22 +92,6 @@ describe 'Issues', feature: true do
 
     let(:issue) { @issue }
 
-    it 'should allow filtering by issues with no specified milestone' do
-      visit namespace_project_issues_path(project.namespace, project, milestone_title: IssuableFinder::NONE)
-
-      expect(page).not_to have_content 'foobar'
-      expect(page).to have_content 'barbaz'
-      expect(page).to have_content 'gitlab'
-    end
-
-    it 'should allow filtering by a specified milestone' do
-      visit namespace_project_issues_path(project.namespace, project, milestone_title: issue.milestone.title)
-
-      expect(page).to have_content 'foobar'
-      expect(page).not_to have_content 'barbaz'
-      expect(page).not_to have_content 'gitlab'
-    end
-
     it 'should allow filtering by issues with no specified assignee' do
       visit namespace_project_issues_path(project.namespace, project, assignee_id: IssuableFinder::NONE)