GitHub Actions Extension Shows Incorrect Job Dependency Error (v0.28.0)

## Bug Report

### Environment
- **VS Code Version:** 1.105.1 (user setup)
- **GitHub Actions Extension Version:** 0.28.0 (updated 3 weeks ago)
- **OS:** Windows_NT x64 10.0.26200
- **Commit:** 7d842fb85a0275a4a8e4d7e040d2625abbf7f084

### Description
The GitHub Actions extension incorrectly validates job dependencies, showing an error for a non-existent job name instead of the actual job name defined in the workflow file.

### Steps to Reproduce
1. Create a GitHub Actions workflow file with a job named `architecture-dependency-check`
2. Create another job that references this job in the `needs:` array
3. The extension shows a validation error referencing a completely different job name

### Expected Behavior
The extension should validate job dependencies against the actual job names present in the current workflow file.

### Actual Behavior
- **Error message displayed:** `Job 'check-no-deployment' depends on unknown job 'foundation-architecture-scan'`
- **Actual file content:** `needs: [build-test, architecture-dependency-check]`
- **GitHub Actions execution result:** Workflow runs successfully on GitHub

### Sample Workflow Code
```yaml
jobs:
build-test:
name: Build and Test
runs-on: ubuntu-latest
# ... job steps

architecture-dependency-check:
name: Architecture Dependency Check
runs-on: ubuntu-latest
# ... job steps

check-no-deployment:
name: Development Branch Status
runs-on: ubuntu-latest
needs: [build-test, architecture-dependency-check] # This line shows the error
# ... job steps
```

Workaround
Disabling and re-enabling the GitHub Actions extension temporarily resolves the issue.

Additional Context
- This issue appears to be related to the extension update from 3 weeks ago (version 0.28.0)
- The workflow file has been working correctly for weeks
- Multiple VS Code restarts do not resolve the issue
- The actual GitHub Actions execution works perfectly
Impact
While this doesn't affect functionality, it creates confusion and false error reporting in the development environment.

まず、サンプルの GitHub Actions workflow で診断を再現します。特に architecture-dependency-check を含む needs 配列に注目し、表示されたエラーと比較してください。拡張機能のジョブ依存関係の検証を追跡し、エラーが実際に参照されているジョブの名前を示していることを確認してください。workflow は誤った警告なしに実行を続ける必要があります。

索引モデルが issue の本文から書いたものです。