Bug - Marker positions not updated when DEM data loads

[dpdiliberto]

mapbox-gl-js version: 2.4.1

browser: Chrome

Steps to Trigger Behavior

1. Add Markers at runtime, where map is pitched and 3D terrain is enabled
2. After raster-dem source is added to the map, the markers end up in the incorrect spot
3. The Markers positions end up in the correct spot after zooming or panning the map again

Link to Demonstration

https://jsfiddle.net/0wku2q8L/

Expected Behavior

We expect that Marker positions would be updated whenever DEM data loads.

Actual Behavior

Currently Marker positions are updated on move and moveend events, but they’re not fired whenever DEM data loads after enabling terrain. We should either subscribe to a corresponding event in the marker code, or fire move on terrain load since it may extent to other similar use cases. https://github.com/mapbox/mapbox-gl-js/blob/main/src/ui/marker.js#L259-L260