Newly pushed branches hints on repository home page (#25715)

This PR will display a pull request creation hint on the repository home
page when there are newly created branches with no pull request. Only
the recent 6 hours and 2 updated branches will be displayed.

Inspired by #14003 
Replace #14003 
Resolves #311
Resolves #13196
Resolves #23743

co-authored by @kolaente

tests/integration/repo_branch_test.go

@@ -120,9 +120,9 @@ func testCreateBranches(t *testing.T, giteaURL *url.URL) {
 			req := NewRequest(t, "GET", redirectURL)
 			resp := session.MakeRequest(t, req, http.StatusOK)
 			htmlDoc := NewHTMLParser(t, resp.Body)
-			assert.Equal(t,
-				test.FlashMessage,
+			assert.Contains(t,
 				strings.TrimSpace(htmlDoc.doc.Find(".ui.message").Text()),
+				test.FlashMessage,
 			)
 		}
 	}