The test uses Vertex Array Objects, and these are only
supported from GLES 3.0 on, or by using the extension
OES_vertex_array_object, so make it part of the
StateChangeTestES3 set.

With that we also enable the test.

Bug: angleproject:5855
Change-Id: I0cfb5d23d19e3db8eefffd9d52b744d068666606
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2850642
Commit-Queue: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>