Remove filter icon with feedback if filters are in custom display mode

[sashberd]

Hi
I set columnFilterDisplayMode: 'custom', and it hide the filter icon
So I added my custom implementation for column Header property with filter icon
However, if you apply filter from my custom filter component that filter icon is back with filter notification popover

IMO, if we use custom filter display mode this one should not be shown at all, since also filter icon not shown
How to get rid of this icon?