fixes breadcrumbs on new issue page. adds link to issues page.

app/views/projects/issues/new.html.haml

-- breadcrumb_title "Issues"
+- add_to_breadcrumbs "Issues", project_issues_path(@project)
+- breadcrumb_title "New"
 - page_title "New Issue"
 
 %h3.page-title

changelogs/unreleased/21305-breadcrumb-link-to-issues-on-new-issue-page.yml

+---
+title: "Fix breadcrumb link to issues on new issue page"
+merge_request: 21305
+author: J.D. Bean
+type: fixed

spec/features/issues/user_sees_breadcrumb_links_spec.rb

+require 'rails_helper'
+
+describe 'New issue breadcrumbs' do
+  let(:project) { create(:project) }
+  let(:user)    { project.creator }
+
+  before do
+    sign_in(user)
+    visit new_project_issue_path(project)
+  end
+
+  it 'display a link to project issues and new issue pages' do
+    page.within '.breadcrumbs' do
+      expect(find_link('Issues')[:href]).to end_with(project_issues_path(project))
+      expect(find_link('New')[:href]).to end_with(new_project_issue_path(project))
+    end
+  end
+end