feat(action): issue change title notifications (go-gitea#33050)

- Add `IssueChangeTitle` method to handle issue title changes
- Add `notifyIssueChangeWithTitleOrContent` method to generalize
notification handling for issue title or content changes

action file as below:

```yaml
name: Semantic Pull Request

on:
  pull_request_target:
    types: [edited]
```

---------

Signed-off-by: Bo-Yi Wu <[email protected]>
Co-authored-by: Giteabot <[email protected]>
Co-authored-by: wxiaoguang <[email protected]>

services/actions/notifier.go

@@ -58,7 +58,15 @@ func (n *actionsNotifier) NewIssue(ctx context.Context, issue *issues_model.Issu
 // IssueChangeContent notifies change content of issue
 func (n *actionsNotifier) IssueChangeContent(ctx context.Context, doer *user_model.User, issue *issues_model.Issue, oldContent string) {
 	ctx = withMethod(ctx, "IssueChangeContent")
+	n.notifyIssueChangeWithTitleOrContent(ctx, doer, issue)
+}
+
+func (n *actionsNotifier) IssueChangeTitle(ctx context.Context, doer *user_model.User, issue *issues_model.Issue, oldTitle string) {
+	ctx = withMethod(ctx, "IssueChangeTitle")
+	n.notifyIssueChangeWithTitleOrContent(ctx, doer, issue)
+}
 
+func (n *actionsNotifier) notifyIssueChangeWithTitleOrContent(ctx context.Context, doer *user_model.User, issue *issues_model.Issue) {
 	var err error
 	if err = issue.LoadRepo(ctx); err != nil {
 		log.Error("LoadRepo: %v", err)