[Fix](nereids) fix merge aggregate rule, rules should not have mutable members #36223
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…e members (apache#36145) This bug is induced by apache#31811. The innerAggExprIdToAggFunc was a member of MergeAggregate, which was wrong. Because rules like MergeAggregate are single instances, same rules applied to different sub-plans will affect each other. This pr changes innerAggExprIdToAggFunc to a local variable, fixes this bug. No regression use case was added because it’s not a problem that will definitely reoccur and requires the same rule to be applied to multiple plans at the same time.
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cherry-pick #36145 to branch-2.1