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Pivot Exports Can Handle `nil` in Breakout Col, and Multiple Cols of the Same Aggregation Type (#50672) (#50780)

* Pivot Exports Can Handle `nil` in Breakout Col, and Multiple Cols of the Same Aggregation Type

Fixes #50551

If a pivot table has several measures configured, they might both use the same kind of
aggregation (eg. 'sum'). Previously, this would lead to columns with the same name preventing the pivot-measures from
properly making it through the export post processing. Now, the correct aliased/deduped name is used and all columns
can be properly included in the pivot export.

Also fixes the case where a breakout column (pivot-row) contains `nil` values, which caused the pivot export to
fail. Now, all nil values are grouped and handled appropriately.

* when pivot is disabled, header should still be included

* min and max don't default to 0, add a test for the aggregations

Co-authored-by: default avataradam-james <21064735+adam-james-v@users.noreply.github.com>
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