update sync_diff_inspector: sync_diff_inspector v2.0 (#6774)

[ti-chi-bot]

This is an automated cherry-pick of #6774

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• v3.0 (TiDB 3.0 versions)
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What is the related PR or file link(s)?

• This PR is translated from: update sync_diff_inspector: sync_diff_inspector v2.0 docs-cn#7353 & update sync-diff-inspector: update settings docs docs-cn#7510
• Other reference link(s):

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

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[Liuxiaozhen12]

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