feat: execute post run cleanup when workflow is cancelled (#37275)

## Fixes #36983

## Summary
1. Add transitional `Cancelling` status (between `Running` and
`Cancelled`); cancel flow marks active tasks `Cancelling`, runner
finalizes to `Cancelled` on terminal result.
2. Taskless jobs cancel directly (no runner to finalize).
3. Runner-protocol responses map `Cancelling` → `RESULT_CANCELLED`.
4. Run/job aggregation treats `Cancelling` as active.
5. Status mapping/aggregation tests + en-US locale added.

**Problem**
When a workflow was cancelled from the UI, jobs were marked cancelled
immediately, which could skip post-run cleanup behavior.

## Solution
Use a transitional status path:
Running → Cancelling → Cancelled
This allows runner finalization and cleanup path execution before final
terminal state.

**Testing**

> 1. go test -tags "sqlite sqlite_unlock_notify" ./models/actions -run
"TestAggregateJobStatus|TestStatusAsResult|TestStatusFromResult"
> 2. go run
github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.11.4 run
./models/actions/... ./routers/api/actions/runner/...

## Related
- act_runner: https://gitea.com/gitea/act_runner/pulls/825 —
independent; this PR's capability gate keeps legacy runners on the
immediate-cancel path. The new flow activates only for runners that
advertise the `cancelling` capability.

Co-authored-by: Nicolas <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

services/actions/notify.go

@@ -18,8 +18,9 @@ func NotifyWorkflowJobsAndRunsStatusUpdate(ctx context.Context, jobs []*actions_
 		return
 	}
 
-	// The input jobs may belong to different runs, so track each affected run.
-	runs := make(map[int64]*actions_model.ActionRun, len(jobs))
+	// The input jobs may belong to different runs, so track each affected run ID
+	// and reload it later to avoid notifying with stale aggregate status.
+	runRepoIDs := make(map[int64]int64, len(jobs))
 	jobsByRunID := make(map[int64][]*actions_model.ActionRunJob)
 
 	for _, job := range jobs {
@@ -29,17 +30,15 @@ func NotifyWorkflowJobsAndRunsStatusUpdate(ctx context.Context, jobs []*actions_
 		}
 		CreateCommitStatusForRunJobs(ctx, job.Run, job)
 
-		if _, ok := runs[job.RunID]; !ok {
-			runs[job.RunID] = job.Run
-		}
+		runRepoIDs[job.RunID] = job.RepoID
 		if _, ok := jobsByRunID[job.RunID]; !ok {
 			jobsByRunID[job.RunID] = make([]*actions_model.ActionRunJob, 0)
 		}
 		jobsByRunID[job.RunID] = append(jobsByRunID[job.RunID], job)
 	}
 
-	for _, run := range runs {
-		NotifyWorkflowRunStatusUpdate(ctx, run)
+	for runID, repoID := range runRepoIDs {
+		NotifyWorkflowRunStatusUpdateWithReload(ctx, repoID, runID)
 	}
 
 	for _, jobs := range jobsByRunID {