Add link to MR when draft status changed

- update test
- update translations

app/views/notify/change_in_merge_request_draft_status_email.html.haml

-%p
-  = _('%{username} changed the draft status of merge request %{mr_reference}' % {username: sanitize_name(@updated_by_user.name), mr_reference: @merge_request.to_reference })
+%p= html_escape(_('%{username} changed the draft status of merge request %{mr_link}')) % { username: link_to(@updated_by_user.name, user_url(@updated_by_user)),
+    mr_link: merge_request_reference_link(@merge_request) }

changelogs/unreleased/cablett-change-draft-status-email.yml

+---
+title: Add link to email notifying of MR changing draft status
+merge_request: 61891
+author:
+type: changed

locale/gitlab.pot

@@ -978,6 +978,9 @@ msgstr ""
 msgid "%{user_name} profile page"
 msgstr ""
 
+msgid "%{username} changed the draft status of merge request %{mr_link}"
+msgstr ""
+
 msgid "%{username} has asked for a GitLab account on your instance %{host}:"
 msgstr ""
 

spec/views/notify/change_in_merge_request_draft_status_email.html.haml_spec.rb

@@ -5,6 +5,7 @@ require 'spec_helper'
 RSpec.describe 'notify/change_in_merge_request_draft_status_email.html.haml' do
   let(:user) { create(:user) }
   let(:merge_request) { create(:merge_request) }
+  let(:merge_request_link) { merge_request_url(merge_request) }
 
   before do
     assign(:updated_by_user, user)
@@ -15,5 +16,7 @@ RSpec.describe 'notify/change_in_merge_request_draft_status_email.html.haml' do
     render
 
     expect(rendered).to have_content("#{user.name} changed the draft status of merge request #{merge_request.to_reference}")
+    expect(rendered).to have_link(user.name, href: user_url(user))
+    expect(rendered).to have_link(merge_request.to_reference, href: merge_request_link)
   end
 end