fix: log metrics that can be coerced to scalars

[terrykong]

What does this PR do ?

previously some val metrics were skipped because a change to the logger skipped over things that were tensors (but looked like scalars)

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Reviewing files that changed from the base of the PR and between 1720466 and 374a94f.

📒 Files selected for processing (2)

• nemo_rl/utils/logger.py
• tests/unit/utils/test_logger.py

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