[popover] Allow using `role` instead of `overlayRole`

[sissbruecker]

Describe your motivation

Currently some internal popover logic relies on the overlayRole property (e.g. __updateAriaAttributes). With refactoring the component to use native popovers the role is now set on the host. As such it would be good if developers could set role directly on the host element instead of having to use a non-standard overlayRole.

Describe the solution you'd like

Allow setting role directly on the popover host element and update internal logic to use role. overlayRole should still work as before and, if it's set, just overwrites role, assuming that developers would either use one or the other.

Describe alternatives you've considered

No response

Additional context

No response