actions: report commit status for pull_request_review events (#36589)

Workflows triggered by pull_request_review events (approved, rejected,
comment) complete successfully but never create a commit status on the
PR. This makes them invisible in the merge checks UI, breaking any CI
gate that re-evaluates on review submission.

The commit status handler's switch statement was missing the three
review event types, so they fell through to the default case which
returned empty strings. Additionally, review events use
PullRequestPayload but IsPullRequest() returns false for them (Event()
returns "pull_request_approved" etc. instead of "pull_request"), so
GetPullRequestEventPayload() refuses to parse their payload.

Signed-off-by: Jörg Thalheim <joerg@thalheim.io>
Co-authored-by: silverwind <me@silverwind.io>

modules/webhook/type.go

@@ -98,6 +98,20 @@ func (h HookEventType) IsPullRequest() bool {
 	return h.Event() == "pull_request"
 }
 
+// IsPullRequestReview returns true for pull request review events
+// (approved, rejected, comment). These events use the same PullRequestPayload
+// as regular pull_request events.
+func (h HookEventType) IsPullRequestReview() bool {
+	switch h {
+	case HookEventPullRequestReviewApproved,
+		HookEventPullRequestReviewRejected,
+		HookEventPullRequestReviewComment:
+		return true
+	default:
+		return false
+	}
+}
+
 // HookType is the type of a webhook
 type HookType = string