<rh-health-index> z-index set too high

[zeroedin]

The z-index value for the current active box in health index is set to 10. This value is static in health index and cannot be adjusted with a component level css prop. I do not believe this value should be set this high when setting to z-index of 1 is sufficient for the internals of the component. I think our components should use the lowest possible z-index when needed as a best practice, or provide the ability to adjust them per use case.

This issue shows up on the ux. website where the health-index self set z-index of 10 becomes higher then any z-index used ux. and therefore overlays the lower set site z-index values.

[markcaron]

Temporarily patching with #1995 until we can discuss our approach to handling z-index across components.