Revert "kafka: decouple batch size from Kafka message size limit (#54…

[3AceShowHand]

…20) (#5772)"

This reverts commit 19ff1fc.

What problem does this PR solve?

Issue Number: close #6011

What is changed and how it works?

revert #5772

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`

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/test all

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lidezhu, wk989898

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[LGTM Timeline notifier]

Timeline:

• 2026-08-17 06:50:58.145798524 +0000 UTC m=+3634044.181893570: ☑️ agreed by wk989898.
• 2026-08-17 06:53:39.739632654 +0000 UTC m=+3634205.775727700: ☑️ agreed by lidezhu.