Remove default values from Tooltips

Enable the ability to selectively remove default values from displaying in tooltips.

This same idea request is bundled into several other tooltip related idea requests that together had over 1,000 votes:

https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/7580157-tooltip-customization-on-reports

https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/14823435-turn-off-tooltip-and-remove-default-tooltip


However, this functionality is still not available and those ideas are marked as completed so we can't even vote the ideas up anymore.