backend/local: fix panic while lightning quits (#33738)

[ti-srebot]

cherry-pick #33738 to release-6.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/33802

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tidb.git pr/33802:release-6.0-15a01fa50a7c

---

What problem does this PR solve?

Issue Number: close #33524

Problem Summary: as the issue

What is changed and how it works?

1. fix the panic log while lightning quits. It's caused by Close pebble before ingestSST for loop quits by check db before ingest.
2. add recover for places that are likely to panic.

Check List

Tests

• Unit test
• Integration test

Side effects

None

Documentation

None

Release note

None

[ti-chi-bot]

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[ti-srebot]

/run-all-tests

[ti-srebot]

@lichunzhu you're already a collaborator in bot's repo.

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/f91e7bf770edea83768fa47c15a463b999a29b9b

[xhebox]

closed for DMR version