Addresses code review findings and Pyrefly warnings in metrics module.

Error Message Correction

MeanPairwiseDistance.compute() raised NotComputableError with incorrect class name reference:

# Before
raise NotComputableError("MeanAbsoluteError must have at least one example...")

# After
raise NotComputableError("MeanPairwiseDistance must have at least one example...")

Updated corresponding test expectation in test_mean_pairwise_distance.py::test_zero_sample.

Redundant Cast Removal

Removed unnecessary cast() calls in Loss.update() where function signature already provides type narrowing:

def update(self, output: tuple[Tensor, Tensor] | tuple[Tensor, Tensor, dict]) -> None:
    if len(output) == 2:
        y_pred, y = output  # cast() removed - type already constrained
    else:
        y_pred, y, kwargs = output  # cast() removed - type already constrained

Removed unused cast import from typing.

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