[Feature] DDPG compatibility with compile

[vmoens]

Stack from ghstack (oldest at bottom):

• [Feature] GAIL compatibility with compile #2573
• [Feature] DQN compatibility with compile #2571
• [Feature] Discrete SAC compatibility with compile #2569
• [Feature] DT compatibility with compile #2556
• -> [Feature] DDPG compatibility with compile #2555
• [Feature] CROSSQ compatibility with compile #2554
• [Feature] CQL compatibility with compile #2553

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2555

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❌ 16 New Failures, 1 Unrelated Failure

As of commit 09afa20 with merge base c8676f4 ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  FAILED ../../../../tmp/test_objectives_benchmarks.py::test_sac_speed[reduce-overhead-None] - torch._dynamo.exc.UserError: Dynamic control flow is not supported at the moment. Please use functorch.experimental.control_flow.cond to explicitly capture the control flow. For more information about this error, see: https://pytorch.org/docs/main/generated/exportdb/index.html#cond-operands
• Libs Tests on Linux / unittests-gym (3.9, 12.1) / linux-job (gh)
  test/test_libs.py::TestGym::test_gym_gymnasium_parallel
• Libs Tests on Linux / unittests-sklearn (3.9, 12.1) / linux-job (gh)
  test/test_libs.py::TestOpenML::test_env[batch_size2-magic]
• Lint / python-source-and-configs / linux-job (gh)
  torchrl/collectors/collectors.py:80:5: F811 redefinition of unused 'cudagraph_mark_step_begin' from line 74
• SOTA Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 9e12470fbb9d2497ffa3cb751d78644af09ce56bcac5a11fc5909ed57518d5c8 /exec failed with exit code 1
• Unit-tests on Linux / tests-cpu (3.10) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_env[SamplingStrategy.RANDOM-False-True-pendulum]
• Unit-tests on Linux / tests-cpu (3.11) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_env[3-False-True-pendulum]
• Unit-tests on Linux / tests-cpu (3.12) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_env[3-False-True-pendulum]
• Unit-tests on Linux / tests-cpu (3.9) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_env[SamplingStrategy.RANDOM-False-True-pendulum]
• Unit-tests on Linux / tests-cpu-oldget (3.12) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_env[3-False-True-pendulum]
• Unit-tests on Linux / tests-gpu (3.11, 12.1) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_env[3-False-True-pendulum]
• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh)
  RuntimeError: Command docker exec -t ef5d5c276aecc47294e6215c1ae3a854bf04c81ac249f1b29bfe235568bbabf5 /exec failed with exit code 1
• Unit-tests on Linux / tests-optdeps (3.11, 12.1) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_compose
• Unit-tests on Linux / tests-stable-gpu (3.10, 11.8) / linux-job (gh)
  test/test_transforms.py::TestActionDiscretizer::test_transform_env[SamplingStrategy.RANDOM-False-True-pendulum]
• Unit-tests on Windows / unittests-cpu / windows-job (gh)
  CommandNotFoundError: Your shell has not been properly configured to use 'conda deactivate'.

BROKEN TRUNK - The following job 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

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