fix(gitlab): add explicit mapping for cancelled status

- Add case for 'cancelled' conclusion in GitLab provider CreateStatus
- Map 'cancelled' to 'canceled' for GitLab API compatibility
- Set descriptive title 'cancelled validating this commit'
- Ensures proper status reporting when PipelineRuns are cancelled via PR close

Author: ab-ghosh

pkg/provider/gitlab/gitlab.go

@@ -263,6 +263,9 @@ func (v *Provider) CreateStatus(_ context.Context, event *info.Event, statusOpts
 	case "neutral":
 		statusOpts.Conclusion = "canceled"
 		statusOpts.Title = "stopped"
+	case "cancelled":
+		statusOpts.Conclusion = "canceled"
+		statusOpts.Title = "cancelled validating this commit"
 	case "failure":
 		statusOpts.Conclusion = "failed"
 		statusOpts.Title = "failed"

pkg/provider/gitlab/gitlab_test.go

@@ -142,6 +142,20 @@ func TestCreateStatus(t *testing.T) {
 				postStr: "has completed",
 			},
 		},
+		{
+			name:       "cancelled conclusion",
+			wantClient: true,
+			wantErr:    false,
+			args: args{
+				statusOpts: provider.StatusOpts{
+					Conclusion: "cancelled",
+				},
+				event: &info.Event{
+					TriggerTarget: "pull_request",
+				},
+				postStr: "has cancelled",
+			},
+		},
 		{
 			name:       "gitops comments completed",
 			wantClient: true,