Interactive elements that are not cells or rows, should not trigger activation (#7603)

* fix(IgxRow): when click over row indicators should not activate cell #7311
* fix(IgxGrid): click over header indicators should not trigger activation #7311
* fix(IgxGrid): non primary click should not clears the cell selection #7529
* fix(IgxCell): activate cell on left click without selection #7529

Co-authored-by: Nadia Robakova <[email protected]>

Author: ddincheva