Fixed using instanced VAT in ShaderMaterial

[noname0310]

This PR resolves the issue https://forum.babylonjs.com/t/missing-doc-for-gpupicker-in-v8-31-3/61295/8

I noticed that PrepareAttributesForBakedVertexAnimation does not function correctly in ShaderMaterial. The reason is as follows:

https://github.com/BabylonJS/Babylon.js/blob/master/packages/dev/core/src/Materials/materialHelper.functions.ts#L415

const enabled = defines["BAKED_VERTEX_ANIMATION_TEXTURE"] && defines["INSTANCES"];

if (enabled) {
    attribs.push("bakedVertexAnimationSettingsInstanced");
}

PrepareAttributesForBakedVertexAnimation checks whether BAKED_VERTEX_ANIMATION_TEXTURE and INSTANCES exist in the defines to determine whether to add the bakedVertexAnimationSettingsInstanced attribute to the list.

However, ShaderMaterial stores the define list as a sequence of “#define DEFINENAME” entries, causing it to fail this test.

This is what it actually looks like when executed on the `ShaderMaterial` in the Edge debugger.

Therefore, I specialized this logic to suit ShaderMaterial.

This approach was chosen based on the observation that specialization had already been performed in the logic for assigning Bone's Define and Attribute within ShaderMaterial.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Snapshot stored with reference name:
refs/pull/17462/merge

Test environment:
https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17462/merge/index.html

To test a playground add it to the URL, for example:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17462/merge/index.html#WGZLGJ#4600

Links to test babylon tools with this snapshot:

https://playground.babylonjs.com/?snapshot=refs/pull/17462/merge
https://sandbox.babylonjs.com/?snapshot=refs/pull/17462/merge
https://gui.babylonjs.com/?snapshot=refs/pull/17462/merge
https://nme.babylonjs.com/?snapshot=refs/pull/17462/merge

To test the snapshot in the playground with a playground ID add it after the snapshot query string:

https://playground.babylonjs.com/?snapshot=refs/pull/17462/merge#BCU1XR#0

[bjsplat]

Interaction tests

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17462/merge/testResults/interactionplaywright/index.html

[bjsplat]

Devhost visualization test reporter:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17462/merge/testResults/devhostplaywright/index.html

[bjsplat]

Visualization tests for WebGPU

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17462/merge/testResults/webgpuplaywright/index.html

[bjsplat]

WebGL2 visualization test reporter:

https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/refs/pull/17462/merge/testResults/webgl2playwright/index.html