[7.11] Revert "Remove aggregation's postCollect phase (#68942) #69066
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This partially reverts #64016 and and adds #67839 and adds
additional tests that would have caught issues with the changes
in #64016. It's mostly Nik's code, I am just cleaning things up
a bit.
Co-authored-by: Nik Everett nik9000@gmail.com