[Test] Fix flaky parallel test

[vmoens]

Stack from ghstack (oldest at bottom):

• -> [Test] Fix flaky parallel test #3204
• [CI] Fix libs #3203

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/3204

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❌ 4 New Failures, 1 Cancelled Job, 2 Unrelated Failures

As of commit 361e2c8 with merge base bd93f13 ():

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 b65b767c18242b5971b18d5d3dc1efb7ed6afdc1dd97565cf76f23ee29c5fd14 /exec failed with exit code 1
• Libs Tests on Linux / unittests-gym (3.9, 12.8) / linux-job (gh)
  RuntimeError: Command docker exec -t fe48fb1cd2ebb5554e74b564ecb3131062bc57a273095b32d521898e1fc996f6 /exec failed with exit code 1
• Unit-tests on Linux / tests-cpu (3.11) / linux-job (gh)
  test/test_transforms.py::TestVecNorm::test_vecnorm_parallel_auto[5]

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

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

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

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

• LLM Tests on Linux / unittests (3.9, 12.8) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• Unit-tests on Linux / tests-cpu (3.9) / linux-job (gh) (trunk failure)
  test/test_env.py::TestNonTensorEnv::test_parallel[False-False]

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