NME: Make the iridescence block available in menus

[Popov72]

See https://forum.babylonjs.com/t/no-iridescence-block-in-node-material-editor/57396/2

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

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https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/TOOLS/refs/pull/16400/merge/nodeGeometryEditor/
https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/TOOLS/refs/pull/16400/merge/nodeRenderGraphEditor/
https://snapshots-cvgtc2eugrd3cgfd.z01.azurefd.net/TOOLS/refs/pull/16400/merge/guiEditor/

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Visualization tests for WebGPU

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