fix(pivot-grid): align IPivotAggregator aggregator type with PivotAggregation 21.2.x#17272

dkamburov merged 2 commits into

21.2.xIgniteUI/igniteui-angular:21.2.xfrom

hhristov/fix-pivot-grid-aggregator-21.2.xIgniteUI/igniteui-angular:hhristov/fix-pivot-grid-aggregator-21.2.xCopy head branch name to clipboard