debug wireframe index overflow in Model

[ptrgags]

in This Sandcastle, I tried rendering Cesium OSM buildings with debugWireframe: true. It mostly works but one building here looks like it exploded

I had a very similar problem when working on #10506, it was due to that one building having very close to 65535 vertices, so the re-indexing caused it to overflow. The fix is to upgrade to a Uint32Array if the new length is above the limit. See these lines in PrimitiveOutlineGenerator.js for more details.

CC @j9liu