Transformation stage 1: Remove deprecated collections

[pzelasko]

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What does this PR do ?

Removed collections: avlm, diffusion, llm, multimodal, multimodal-autoregressive, nlp, speechlm, vision, vlm.

Collection: [Note which collection this PR will affect]

Changelog

• Removed collections: avlm, diffusion, llm, multimodal, multimodal-autoregressive, nlp, speechlm, vision, vlm.

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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Additional Information

• Related to # (issue)

[github-actions]

[🤖]: Hi @pzelasko 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.

//cc @chtruong814 @ko3n1g @pablo-garay @thomasdhc

[pzelasko]

I think we should ignore CodeQL here, it's flagging stuff that did not change in this PR.

[coderabbitai]

Caution

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch remove-deprecated-collections

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[github-actions]

[🤖]: Hi @pzelasko 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.

//cc @chtruong814 @ko3n1g @pablo-garay @thomasdhc

[pzelasko]

Passed all tests so CI and overall structure seems intact. I’m ignoring CodeQL scan as it flags issues not introduced here. LGTM!