Modify downstream database permissions

[glkappe]

tidb user needs to create dm_meta database

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For details, see tips for choosing the affected versions (in Chinese).

• [x] master (the latest development version)
• [x] v6.2 (TiDB 6.2 versions)
• [x] v6.1 (TiDB 6.1 versions)
• [x] 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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• [ ] Delete files
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn
• lance6716

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[ran-huang]

/merge

[ti-chi-bot]

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

Commit hash: 70ca421c6d32b4afa71943fb0310c042c14920bf

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #12835.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #12836.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.2: #12837.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #12838.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12840.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #12842.