*: add 6.2.0 release notes

[shichun-0415]

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

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• [x] master (the latest development version)
• [x] v6.2 (TiDB 6.2 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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• [ ] Delete files
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• [ ] Might cause conflicts after applied to another branch

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn
• hfxsd

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[shichun-0415]

/merge

[ti-chi-bot]

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

Commit hash: de6537e60c2f9416531d0180f9db5c77dc81f3ab

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #11037.