[v8.5.6] docs: update sync-diff-inspector docs for move to tiflow repo (#20001)

[ti-chi-bot]

This is an automated cherry-pick of #20001

What is changed, added or deleted? (Required)

This PR updates the documentation to reflect the move of sync_diff_inspector from tidb-tools to tiflow repository for TiDB 9.0.0 and later versions. The changes include:

• Update GitHub repository links from tidb-tools to tiflow
• Add TiUP installation method for v9.0.0+
• Update Docker image references
• Add version-specific installation instructions
• Update download-ecosystem-tools.md with new package information

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

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• 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)

What is the related PR or file link(s)?

• This PR is translated from: docs: update sync-diff-inspector docs for move to tiflow repo docs#20140

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

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