feat: highlight issue references with : (#8101)

* feat: highlight issue references with :

e.g. #1287: my commit msg
e.g. ABC-1234: my commit msg

* ref: update model regex to consistent with issueNumericPattern

* test: check highlight issue with : in commits messages

models/action_test.go

@@ -186,6 +186,7 @@ func TestRegExp_issueReferenceKeywordsPat(t *testing.T) {
 		"#2",
 		"[#2]",
 		"please see go-gitea/gitea#5",
+		"#2:",
 	}
 	falseTestCases := []string{
 		"kb#2",