Some errors are not handled correctly

[ricardojvsoares]

Running the migration with nodeart-bq-cli migrate fails because the provided schema does not match the existing table schema in BigQuery. Specifically, the migration tries to add a required field to the existing table, which BigQuery does not allow.

Expected behavior
The migration should either:

• Add the field as nullable (if that's the intended behavior), or
• Provide a clear migration strategy for required fields (e.g., create a new table or allow default values).

Actual behavior
Migration fails with an INVALID_ARGUMENT error because BigQuery does not allow adding required fields to an existing table schema.