Add `WithPullRequest` for `actionsNotifier` (#25144) (#25196)

Backport #25144 by @Zettat123

Fix #25093

If
[`WithPullRequest`](679b1f7949/services/actions/notifier_helper.go (L90-L96))
is not called, the `Ref` in
[`notifyInput`](679b1f7949/services/actions/notifier_helper.go (L55-L65))
will be empty, so the workflows in the head branch will not be found and
triggered.

Co-authored-by: Zettat123 <zettat123@gmail.com>

services/actions/notifier.go

@@ -81,6 +81,7 @@ func (n *actionsNotifier) NotifyIssueChangeStatus(ctx context.Context, doer *use
 		newNotifyInputFromIssue(issue, webhook_module.HookEventPullRequest).
 			WithDoer(doer).
 			WithPayload(apiPullRequest).
+			WithPullRequest(issue.PullRequest).
 			Notify(ctx)
 		return
 	}
@@ -136,6 +137,7 @@ func (n *actionsNotifier) NotifyIssueChangeLabels(ctx context.Context, doer *use
 				Repository:  convert.ToRepo(ctx, issue.Repo, perm_model.AccessModeNone),
 				Sender:      convert.ToUser(ctx, doer, nil),
 			}).
+			WithPullRequest(issue.PullRequest).
 			Notify(ctx)
 		return
 	}
@@ -160,6 +162,10 @@ func (n *actionsNotifier) NotifyCreateIssueComment(ctx context.Context, doer *us
 	mode, _ := access_model.AccessLevel(ctx, doer, repo)
 
 	if issue.IsPull {
+		if err := issue.LoadPullRequest(ctx); err != nil {
+			log.Error("LoadPullRequest: %v", err)
+			return
+		}
 		newNotifyInputFromIssue(issue, webhook_module.HookEventPullRequestComment).
 			WithDoer(doer).
 			WithPayload(&api.IssueCommentPayload{
@@ -170,6 +176,7 @@ func (n *actionsNotifier) NotifyCreateIssueComment(ctx context.Context, doer *us
 				Sender:     convert.ToUser(ctx, doer, nil),
 				IsPull:     true,
 			}).
+			WithPullRequest(issue.PullRequest).
 			Notify(ctx)
 		return
 	}