refactor(grid): update advanced and excel filtering samples (vnext)#3720

adrianptrv wants to merge 7 commits intovnextIgniteUI/igniteui-angular-samples:vnextfrom

apetrov/grid-advanced-excel-samples-vnextIgniteUI/igniteui-angular-samples:apetrov/grid-advanced-excel-samples-vnextCopy head branch name to clipboard