Extra memory allocated during partial aggregation early emit during OOM handling #22164

Describe the bug

When the partial hash aggregation with GroupOrdering::None cannot reserve more memory, it switches to an early emit phase with EmitTo::First(n), where n is close to the length of group_values. take_n implementations use first_n_offsets = self.offsets.drain(0..n).collect::<Vec<_>>();, which copies the n elements into a new allocation. Furthermore, drain doesn't affect the Vec's capacity, so no memory freeing is done.

To Reproduce

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Expected behavior

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Additional context

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