Add commit statuses reports on pull request view (#6845)

* Add commit statuses reports on pull view

* Add some translations

* improve the UI

* fix fmt

* fix tests

* add a new test git repo to fix tests

* fix bug when headRepo or headBranch missing

* fix tests

* fix tests

* fix consistency

* fix tests

* fix tests

* change the test repo

* fix tests

* fix tests

* fix migration

* keep db size consistency

* fix translation

* change commit hash status table unique index

* remove unused table

* use char instead varchar

* make hashCommitStatusContext private

* split merge section with status check on pull view ui

* fix tests; fix arc-green theme on pull ui

models/fixtures/issue.yml

@@ -86,3 +86,14 @@
   created_unix: 946684830
   updated_unix: 978307200
 
+-
+  id: 8
+  repo_id: 10
+  index: 1
+  poster_id: 11
+  name: pr2
+  content: a pull request
+  is_closed: false
+  is_pull: true
+  created_unix: 946684820
+  updated_unix: 978307180