Update status check for all supported on.pull_request.types in Gitea (#33117)

Thanks @Zettat123
Follow #33116
Fix #33051

on.pull_request.types doc:

https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request

on.pull_request.types added in this PR:
```
assigned, unassigned, review_requested, review_request_removed, milestoned, demilestoned, labeled, unlabeled
```

unsupported types in Gitea:
```
// Unsupported activity types:
// converted_to_draft, ready_for_review, locked, unlocked, auto_merge_enabled, auto_merge_disabled, enqueued, dequeued
```

TODO:
- [x] add test

models/actions/run.go

@@ -154,7 +154,7 @@ func (run *ActionRun) GetPushEventPayload() (*api.PushPayload, error) {
 }
 
 func (run *ActionRun) GetPullRequestEventPayload() (*api.PullRequestPayload, error) {
-	if run.Event == webhook_module.HookEventPullRequest || run.Event == webhook_module.HookEventPullRequestSync {
+	if run.Event.IsPullRequest() {
 		var payload api.PullRequestPayload
 		if err := json.Unmarshal([]byte(run.EventPayload), &payload); err != nil {
 			return nil, err