[Refactor] Remove LLM features for release

[vmoens]

Stack from ghstack (oldest at bottom):

• [Refactor] Refactor the weight update logic #2914
• -> [Refactor] Remove LLM features for release #2912

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2912

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❌ 4 New Failures, 1 Cancelled Job, 13 Pending

As of commit 79e47af with merge base 0475cbf ():

NEW FAILURES - The following jobs have failed:

• Generate documentation / build-docs (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 6fc301c94b83f70da09094f0679d926ebb5594e010b28bdb39b1d883709dc625 /exec failed with exit code 2
• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t eaeb4bbadef412174489d3b27d98db745f2ab498e4aa9e1ac15ef387a3f30f7d /exec failed with exit code 1
• LLM Tests on Linux / unittests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 4767efc68115fa81debca8dc81a69e3f5aaddda27b957f61f540f7963ea5fa1d /exec failed with exit code 4
• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh)
  RuntimeError: Command docker exec -t 73bc0a70d213bf149befb269a62a65b7229949a46d584189abf2c9ea83727189 /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)

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