Revert "mesa, compiler: Move gl_texture_index to glsl_types.h"

Revert "mesa, compiler: Move gl_texture_index to glsl_types.h"

This reverts commit 1b836a52ea2dcc0b77a48a2a3d1f9052321cf325.  This
patch, while claiming to decouple things, actually increases coupling
because it leaks two OpenGL state tracker limits and an OpenGL state
tracker fixed binding enum into the entire compiler.  Nothing wants to
know these outside the OpenGL state tracker and the GL-specific compiler
passes.  Put them back where they were.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24491>