Add tests for the `NonBlockingRWFifo` class
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### What needs to get done
Tests should be added to ensure the functionality of the `NonBlockingRWFifo` class.
### Why it needs to get done
Spawned by the following TODO comment:
https://github.com/canonical/craft-parts/blob/bff2fa08c74fd426d18f3266c1ec3945929d4a5f/tests/unit/utils/test_file_utils.py#L262
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