Update aggregate probe to be locked only if skipping aggregation #18766
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Which issue does this PR close?
Rationale for this change
If we always set the probe to locked, we let go of the ability to skip partial aggregation during processing a future record batch when the ratio does meet the required threshold to skip.
What changes are included in this PR?
Lock the aggregation probe only if we are skipping not when just the number of rows threshold is met.
Are these changes tested?
This change should be covered by existing aggregate tests.
Are there any user-facing changes?
No