Flag to turn off parquet load on Greenplum

[rad-pat]

This was in my local but I'd obvs forgot to merge it in, flag already available in RPC call.

[github-actions]

File	Coverage
All files	39%	❌
plaidcloud/utilities/analyze_table.py	36%	❌
plaidcloud/utilities/bom.py	24%	❌
plaidcloud/utilities/clean_files.py	28%	❌
plaidcloud/utilities/connect.py	35%	❌
plaidcloud/utilities/convert_encoding.py	31%	❌
plaidcloud/utilities/data_helpers.py	26%	❌
plaidcloud/utilities/frame_manager.py	19%	❌
plaidcloud/utilities/pretty_size.py	91%	✅
plaidcloud/utilities/query.py	21%	❌
plaidcloud/utilities/sql_expression.py	85%	✅
plaidcloud/utilities/sqlalchemy_functions.py	63%	❌
plaidcloud/utilities/sqlalchemy_views.py	92%	✅
plaidcloud/utilities/stringtransforms.py	76%	✅
plaidcloud/utilities/udf.py	16%	❌
plaidcloud/utilities/utility.py	19%	❌
plaidcloud/utilities/xray.py	88%	✅
plaidcloud/utilities/remote/dim_helpers.py	10%	❌
plaidcloud/utilities/remote/dimension.py	32%	❌

Minimum allowed coverage is 75%

Generated by 🐒 cobertura-action against 7d45c4a