Fix lint issues in predictions_to_bigquery component.

[cfezequiel]

Expected Behavior

Pre-commit checks pass in predictions_to_bigquery Python files.

Actual Behavior

Pre-commit checks are ignored for said files.
i.e. due to # pylint: skip-file comment in each file.

Steps to Reproduce the Problem

pre-commit run --files tfx_addons/predictions_to_bigquery/*