fix(spider-storage): Cancel the service when a background tokio task exits on error.

[LinZhihao-723]

Description

Before this PR, the storage runtime didn't track the background tokio tasks' status. That means the background tasks may exit silently on error. This PR fixes this issue by:

• Adding a log statement to keep track of the service cancellation.
• Fire the service-wise cancellation token.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

• Ensure all workflows pass.

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of background service failures by logging errors and automatically stopping related services when critical tasks fail.
  • Enhanced shutdown behaviour for job cache cleanup and task instance management.

[coderabbitai]

Walkthrough

Job cache GC and task instance pool actor tasks now log run failures and cancel their shared CancellationToken when errors occur.

Changes

Actor failure cancellation

Layer / File(s)	Summary
Actor error handling components/spider-storage/src/state/job_cache_gc.rs, components/spider-storage/src/task_instance_pool.rs	Spawned actor tasks inspect run errors, log them with tracing::error!, and cancel the shared CancellationToken.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• y-scope/spider#324: Introduced the cancellation-token-driven task instance pool actor factory whose failure handling is updated here.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: background Tokio task failures now trigger service cancellation.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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