lightning: maintain task meta in singleTaskMetaMgr (#34214)

[ti-srebot]

cherry-pick #34214 to release-5.3
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/34225

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

git push git@github.com:ti-srebot/tidb.git pr/34225:release-5.3-59566fad343c

---

What problem does this PR solve?

Issue Number: close #34213

Problem Summary:

Lightning precheck doesn't check local disk resources and cluster available.

What is changed and how it works?

When incremental-import is set to false, Lightning doesn't create a metadata schema in downstream TiDB. Instead, it creates a singleTaskMetaMgr to maintain task metadata. However, singleTaskMetaMgr always returns true for task existence check.

tidb/br/pkg/lightning/restore/meta_manager.go

Line 1088 in 9fc73ac

return true, nil

Precheck for local disk resources and cluster available are accidentally skipped. Because lightning thinks the check has been performed before.

tidb/br/pkg/lightning/restore/restore.go

Line 1923 in 9fc73ac

taskExist, err = rc.taskMgr.CheckTaskExist(ctx)

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Fix the issue that Lightning precheck doesn't check local disk resources and cluster available.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• D3Hunter
• gozssky

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/2b63ba658553322ef75b90384b32dbc3cd2ecac1

[sleepymole]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 2b63ba6