Fix invalid string formatting syntax in evaluation error message

[Copilot]

Fixes a syntax error in evaluation_process.py where .join{sample.keys()} would fail at runtime.

Changes

• Corrected malformed string concatenation to use f-string with proper join() syntax
• Improved error message clarity

Before:

raise ValueError(
    "Expected transcript column of either 'text', 'sentence', 'normalized_text' or 'transcript'. Got sample of "
    ".join{sample.keys()}. Ensure a text column name is present in the dataset."
)

After:

raise ValueError(
    f"Expected transcript column of either 'text', 'sentence', 'normalized_text' or 'transcript'. "
    f"Got sample with keys: {', '.join(sample.keys())}. Ensure a text column name is present in the dataset."
)

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