Add rename_metrics to Mlflow logger

[hanlint]

What does this PR do?

This PR allows users to rename metrics in MLflow by providing a dict mapping. This requires an exact match.

logger = MlflowLogger(
    rename_metrics={'loss/train': 'loss'}
)

Additionally, this PR also refactors several tests in test_mlflow_loggers to be more modular and parameterized.

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[dakinggg]

lgtm