fix the table schema for cluster_tidb_index_usage

[YangKeao]

First-time contributors' checklist

• [x] I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Previously, the table schema for cluster_tidb_index_usage is wrong 🤦 . It's caused by a careless copy-paste. Now it's modified to the correct table schema.

Which TiDB version(s) do your changes apply to? (Required)

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For details, see tips for choosing the affected versions.

• [x] master (the latest development version)
• [x] v8.4 (TiDB 8.4 versions)
• [x] v8.3 (TiDB 8.3 versions)
• [x] v8.2 (TiDB 8.2 versions)
• [x] v8.1 (TiDB 8.1 versions)
• [ ] v7.5 (TiDB 7.5 versions)
• [ ] v7.1 (TiDB 7.1 versions)
• [ ] v6.5 (TiDB 6.5 versions)
• [ ] v6.1 (TiDB 6.1 versions)
• [ ] v5.4 (TiDB 5.4 versions)
• [ ] v5.3 (TiDB 5.3 versions)

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Do your changes match any of the following descriptions?

• [ ] Delete files
• [ ] Change aliases
• [ ] Need modification after applied to another branch
• [ ] Might cause conflicts after applied to another branch

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-12-25 01:55:58.82906835 +0000 UTC m=+1613148.917870892: :ballot_box_with_check: agreed by qiancai.

[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #19792.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19793.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19794.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #19795.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #19796.