Revert "Add support for the EXT_multisampled_render_to_texture extension and use it for WebXR (#22550)" (#22625)

This reverts commit c789b20e.

* three.js shader language

* cleanup

* Update webgpu_sandbox.jpg

* Rename TJSL to ShaderNode and cleanup

* cleanup

Resolve issue where association mappings are missing for meshes when several glTF node definitions reference the same mesh data, and the mesh data has multiple primitives.Resolve issue where association mappings are missing for meshes when several glTF node definitions reference the same mesh data, and the mesh data has multiple primitives. (#22583)

USDZExporter: Fix output

* Node: Generate once support

* cleanup

* WebGLNodeBuilder: fix sRGBEncoding map using WebGL2

* WebGLNodeBuilder: fix sRGBEncoding map using WebGL2 (style 2)

* docs: fixed broken link in manual for korean

* docs: fixed broken link in manual for korean

* Nodes: .type to .nodeType

* rename: type to nodeType

* Add iterators to vectors

* Provide documentation

* Update translated documentation

Copy English documentation where applicable. Some languages did not
contain the math directory, which is where the English vector
documentation is located.