[BugFix] Fix TDLambdaEstimator 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

Make vectorized property return False during compile to avoid vectorized
code paths that may cause issues. Also ensure lmbda device matches the
input reward tensor device.

[pytorch-bot]

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❌ 2 New Failures, 17 Pending

As of commit f9679cb 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 ac544858793a181b93c8881f0dd35c2e2b25a48a55fd4e1428404f50d3555f03 /exec failed with exit code 1
• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t b6d5ae5d1014075ed8a94bc6c05bd2f11c97c963c8a2114442e0bf967f4f5479 /exec failed with exit code 1

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