[BugFix] ActionDiscretizer scalar integration

[vmoens]

Stack from ghstack (oldest at bottom):

• [Feature, Test] Adding tests for envs that have no specs #2621
• -> [BugFix] ActionDiscretizer scalar integration #2619

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2619

• 📄 Preview Python docs built from this PR

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❌ 5 New Failures, 8 Unrelated Failures

As of commit fc0ae29 with merge base 90c8e40 ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  FAILED ../../../../../../tmp/test_objectives_benchmarks.py::test_sac_speed[True-None] - torch._dynamo.exc.Unsupported: Graph break under GenericContextWrappingVariable
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  FAILED ../../../../tmp/test_objectives_benchmarks.py::test_sac_speed[True-None] - torch._dynamo.exc.Unsupported: Graph break under GenericContextWrappingVariable
• SOTA Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 0e036b72358aac84bfb4fe0f5ae50258bbd6c4bc2b54bda66fe59afb5b1da853 /exec failed with exit code 1
• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh)
  RuntimeError: Command docker exec -t 20ba602975f872b390e6aa5a9115450569b502afe3552779e8e12a709d4a84d1 /exec failed with exit code 1
• Unit-tests on Windows / unittests-cpu / windows-job (gh)
  ##[error]fatal: couldn't find remote ref refs/pull/2619/merge

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

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

• Habitat Tests on Linux / tests (3.9, 12.1) / linux-job (gh) (trunk failure)
  AttributeError: _ARRAY_API not found
• Unit-tests on Linux / tests-cpu (3.10) / linux-job (gh) (trunk failure)
  test/test_loggers.py::TestMLFlowLogger::test_log_video[steps1]
• Unit-tests on Linux / tests-cpu (3.11) / linux-job (gh) (trunk failure)
  test/test_loggers.py::TestMLFlowLogger::test_log_video[steps1]
• Unit-tests on Linux / tests-cpu (3.12) / linux-job (gh) (trunk failure)
  test/test_loggers.py::TestMLFlowLogger::test_log_video[steps1]
• Unit-tests on Linux / tests-cpu (3.9) / linux-job (gh) (trunk failure)
  test/test_loggers.py::TestMLFlowLogger::test_log_video[steps1]
• Unit-tests on Linux / tests-cpu-oldget (3.12) / linux-job (gh) (trunk failure)
  test/test_loggers.py::TestMLFlowLogger::test_log_video[steps1]
• Unit-tests on Linux / tests-gpu (3.11, 12.1) / linux-job (gh) (trunk failure)
  test/test_loggers.py::TestMLFlowLogger::test_log_video[steps1]
• Unit-tests on Linux / tests-stable-gpu (3.10, 11.8) / linux-job (gh) (trunk failure)
  test/test_loggers.py::TestMLFlowLogger::test_log_video[steps1]

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