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

integrations/gitea-repositories-meta/user13/repo11.git/refs/heads/branch2

@@ -0,0 +1 @@
+0abcb056019adb8336cf9db3ad9d9cf80cd4b141

integrations/pull_merge_test.go

@@ -159,7 +159,7 @@ func TestCantMergeWorkInProgress(t *testing.T) {
 		req := NewRequest(t, "GET", resp.Header().Get("Location"))
 		resp = session.MakeRequest(t, req, http.StatusOK)
 		htmlDoc := NewHTMLParser(t, resp.Body)
-		text := strings.TrimSpace(htmlDoc.doc.Find(".merge.segment > .text.grey").Text())
+		text := strings.TrimSpace(htmlDoc.doc.Find(".merge-section.segment > .text.grey").Text())
 		assert.NotEmpty(t, text, "Can't find WIP text")
 
 		// remove <strong /> from lang