Finish removing client side vertex array code

GLES2Interface no longer allows using client side vertex arrays. Finish
ripping out code in VertexArrayObjectManager to track them. This is
mostly removing code tracking if buffer zero was unused in any enable
vertex attributes. This code wasn't used outside tests so it should be a
no-op.

The only functional change is no longer allowing setting
SetAttribPointer() with 0 bound to GL_ARRAY_BUFFER when default VBO is
bound. That was only allowed for client side vertex arrays so shouldn't
be needed anymore.

Bug: 439823997
Change-Id: I93f3c806b168491cd0392d2e8a68590c0dfe158a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6920233
Commit-Queue: Kyle Charbonneau <kylechar@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1513305}