Coverage report for `nemo_rl/distributed/model_utils.py` is incorrect

**Describe the bug**

For a coverage report like https://app.codecov.io/gh/NVIDIA-NeMo/RL/blob/main/nemo_rl%2Fdistributed%2Fmodel_utils.py , only the function signatures are marked as covered (i.e., green), while the statements of the function are marked as uncovered (red). In reality, those statements should be marked as covered.

**Steps/Code to reproduce bug**

Run a L1 CI run and check out the coverage report.

**Expected behavior**

The statements within each function should be marked as covered; maybe not all of the statements, but definitely shouldn't be zero.

**Environment overview (please complete the following information)**

**Environment details**

**Additional context**

Discovered while working on https://github.com/NVIDIA-NeMo/RL/pull/918/checks?check_run_id=48136029019
Corresponding coverage report:
https://app.codecov.io/gh/NVIDIA-NeMo/RL/pull/918?dropdown=coverage&src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=checks&utm_campaign=pr+comments&utm_term=NVIDIA-NeMo