[BugFix] Fix ModelBasedEnvBase for torch.compile compatibility

[vmoens]

Stack from ghstack (oldest at bottom):

• [Feature] Add _Contiguous module and reshape improvements to encoders/decoders #3306
• [BugFix] Fix SliceSampler for torch.compile compatibility #3298
• [Feature] Refactor Dreamer training with async collectors, profiling, and improved config #3308
• [Feature] Add noise argument and scan mode to RSSMRollout #3307
• [Feature] Add explicit dimensions and device support to RSSM modules #3305
• [Refactor] Use compile-aware helpers in Dreamer objectives #3304
• [BugFix] Fix value functions for torch.compile compatibility #3303
• [BugFix] Fix TDLambdaEstimator for torch.compile compatibility #3302
• [BugFix] Optimize DreamerEnv to avoid CUDA sync in done checks #3301
• [Feature] Add allow_done_after_reset parameter to ModelBasedEnvBase #3300
• -> [BugFix] Fix ModelBasedEnvBase for torch.compile compatibility #3299
• [Refactor] Add compile-aware timing and profiling helpers #3297
• [Feature] Support callable scale in IndependentNormal and TanhNormal distributions #3296
• [Refactor] Use non_blocking transfers in distribution modules #3295
• [Refactor] Add WEIGHT_SYNC_TIMEOUT constant for collector weight synchronization #3294
• [Refactor] Remove MUJOCO_EGL_DEVICE_ID auto-setting from torchrl init #3293

Convert spec keys to list before unpacking, as dynamo cannot unpack
_CompositeSpecKeysView objects during tracing.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/3299

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❌ 2 New Failures, 17 Pending

As of commit 9ce6902 with merge base df00d61 ():

NEW FAILURES - The following jobs have failed:

• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 21a5e1e64e2265391342333113203d42a5332ec90fb1c3e9f87bc1ea1a4d1a4d /exec failed with exit code 1
• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 1dfdd47035ceff74c3b76a1875b0d415b7816481d1c2cb66fe3b832911edf6d9 /exec failed with exit code 1

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