[Tests] Fix vmas seeding test

[matteobettini]

Wow so basically the seeding test was using a random policy and implicitly relying on the fact that vmas.seed(0) was setting the global torch seed (so the policy was also seeded)

Now, since vmas.seed(0) is local (thanks to the changes we discussed on Discord) this implicit behavior emerged, confirming that local seeding works!

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/3210

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❌ 5 New Failures, 6 Unrelated Failures

As of commit f68038e with merge base 071d079 ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Habitat Tests on Linux / tests (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t b42ad46961c523d4a0a207f328014a94255cfedd6012a8fd2f17527682e436a7 /exec failed with exit code 1
• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t f6e3a43cada7dd27c121c43b6ed646eedcdd9304f9978d8126249364798b6cc6 /exec failed with exit code 1
• Libs Tests on Linux / unittests-jumanji (3.10, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 5a48eaf5ffea2b69ddab2502a7bf9dc03edeefd1ffa03c9fa34b6c2130ecf843 /exec failed with exit code 250
• Lint / python-source-and-configs / linux-job (gh)
  RuntimeError: Command docker exec -t 9fedf5807d7345d7351f68d8636c3a2103fdd8570c85dc9963d6b8d9dba805ea /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Continuous Benchmark (PR) / GPU Pytest benchmark (gh) (similar failure)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Continuous Benchmark / CPU Pytest benchmark (gh) (trunk failure)
  Process completed with exit code 1.
• Continuous Benchmark / GPU Pytest benchmark (gh) (trunk failure)
  ##[error]The operation was canceled.
• Libs Tests on Linux / unittests-envpool (3.10, 12.8) / linux-job (gh) (trunk failure)
  test/test_libs.py::TestEnvPool::test_multithreaded_env_seed[False-1-CheetahRun-v1]
• Libs Tests on Linux / unittests-robohive (3.9, 12.8) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• LLM Tests on Linux / unittests (3.9, 12.8) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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