Fix reference leak on AO/AOCS partition tables with unique index.

Fix https://github.com/cloudberrydb/cloudberrydb/issues/557.

This issue also exists for AOCS.

This is introduced by GPDB commit ed364586b99. For AO/AOCS partition tables, it's possible to update across partitions. And it does have deleteDesc and uniqueCheckDesc if there were. The DeleteDesc and InsertDesc are not enough to decide if the partition has a update operation or not. Some partitions have visimap but some not, clean them if possible.

Authored-by: Zhang Mingli avamingli@gmail.com

fix #ISSUE_Number

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apache / cloudberry