Map pins on event and directory venue pages

[RyanFH257]

Pins on directory and event maps have the attribute role="button", which means they get announced as buttons to assistive technology users.

This attribute is only needed for the maps that appear on directory channel pages as the pins on these maps display a tooltip with a link. The pins also have alt text which acts as the label (name) for the button.

The pins on event and directory venue pages are not interactive so the attribute role="button" should be removed. The pins are also missing alt text which means they have no label for screen readers to announce.

The title attribute should also be removed from directory channel maps.