Add a doctor command to fix inconsistent run status (#35840) (#35845)

Backport #35840

#35783 fixes an actions rerun bug. Due to this bug, some runs may be
incorrectly marked as `StatusWaiting` even though all the jobs are in
done status. These runs cannot be run or cancelled. This PR adds a new
doctor command to fix the inconsistent run status.

```
gitea doctor check --run fix-actions-unfinished-run-status --fix
```

services/doctor/actions_test.go

@@ -0,0 +1,24 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package doctor
+
+import (
+	"testing"
+
+	actions_model "code.gitea.io/gitea/models/actions"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/log"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_fixUnfinishedRunStatus(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	fixUnfinishedRunStatus(t.Context(), log.GetLogger(log.DEFAULT), true)
+
+	// check if the run is cancelled by id
+	run := unittest.AssertExistsAndLoadBean(t, &actions_model.ActionRun{ID: 796})
+	assert.Equal(t, actions_model.StatusCancelled, run.Status)
+}