v8.5.6: DM supports MySQL 8.4 (#22505)

[ti-chi-bot]

This is an automated cherry-pick of #22505

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 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:

• Other reference link(s):

• dm: Add MySQL 8.4 info to compatibility catalog #22041

• DM: Support MySQL 8.4 tiflow#11020

• DM: Support for MySQL 8.4 tiflow#12396

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]

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[gemini-code-assist]

Code Review

This pull request updates the DM compatibility catalog to reflect that MySQL 8.4 is now experimentally supported starting from TiDB v8.5.6. It also adds specific notes and documentation links regarding the lack of support for binlog transaction compression for MySQL versions 8.0 through 8.4. I have no feedback to provide.

[Oreoxmt]

/hold

[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	9db8e52	link	true	/test pull-verify

Full PR test history. Your PR dashboard.

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