[Backport 2.19-dev] Remove count aggregation for sort on aggregate measure (#4867)

[LantaoJin]

(cherry picked from #4867 commit 0ab2ba2)

[coderabbitai]

Important

Review skipped

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Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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