[CI Fest] Fix flaky performance test decimal_aggregates

[alesapin]

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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Split query into multiple queries to consume less memory at once + use less data. Fixes #67034.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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• Woolen Wolfdog
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[robot-ch-test-poll4]

This is an automated comment for commit 4ee4090 with description of existing statuses. It's updated for the latest CI running

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Successful checks

Check name	Description	Status
Performance Comparison	Measure changes in query performance. The performance test report is described in detail here. In square brackets are the optional part/total tests	✅ success
Style check	Runs a set of checks to keep the code style clean. If some of tests failed, see the related log from the report	✅ success

[alesapin]

Aaand not it's unstable

[alesapin]

Okay, two unstable but at least it doesn't crash with OOM