SQL Server Test fail after migration to Duckdb Backend for Pandas dataframes #1764

Describe the bug
Tests test_column_validation_ss_types_to_bigquery and test_row_validation_comp_fields_ss_types_to_bigquery fail due to overflow of DECIMAL(18,3). There appear to be more than 18 digits in the value - which means the overflow is legitimate. Also see issue 1763

FAILED tests/system/data_sources/test_sql_server.py::test_column_validation_ss_types_to_bigquery - sqlalchemy.exc.ProgrammingError: (duckdb.duckdb.InvalidInputException) Invalid Input Error: Attempting to execute an unsucce...
FAILED tests/system/data_sources/test_sql_server.py::test_row_validation_comp_fields_ss_types_to_bigquery - sqlalchemy.exc.ProgrammingError: (duckdb.duckdb.InvalidInputException) Invalid Input Error: Attempting to execute an unsucce...

What version of DVT are you using?
Ex: 7.1.0

What type of connections are you using for source and target?
SQL Server and BigQuery

Steps to reproduce the behavior
Ex: 1. Add '...'
2. Execute '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

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How are you executing DVT?
Ex: CLI commands on local computer or VM, within a DAG, Cloud Run job, etc

Additional context
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