tidb: fix the name of tidb-max-reuse-chunk and tidb-max-reuse-column

[Oreoxmt]

What is changed, added or deleted? (Required)

Close #12556

This PR modifies the name of tidb_max_reuse_chunk and tidb_max_reuse_column to tidb-max-reuse-chunk and tidb-max-reuse-column.

To keep it consistent with https://github.com/pingcap/tidb/blob/0519e7ee6be916390e5cf1da88ef7dc8f638145e/config/config.go#L301-L304

TiDB v6.4 introduces these two items, so this PR applies to v6.4 and later versions.

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• master (the latest development version)
• v6.6 (TiDB 6.6 versions)
• v6.5 (TiDB 6.5 versions)
• v6.4 (TiDB 6.4 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)

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Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• shichun-0415

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[Oreoxmt]

/status LGT1

[shichun-0415]

LGTM

[Oreoxmt]

/merge

[ti-chi-bot]

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

Commit hash: 6c13e58

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12560.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #12561.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #12562.