Refactor Serializers

[CarsonDavis]

Description

We would like to remove the delta_urls_count, curated_urls_count, match_pattern_type from the DeltaURLSerializer and CuratedURLSerializer. This requires more investigation.
These columns are used as hidden columns in the JS. DataTables stores these as hidden columns and the JS reads from this when performing the delete operations.

Implementation Considerations

If we want to remove these fields, we'd need to:

• Restructure how pattern deletion works
• Find another way to get the count and type info when needed
• Remove the columns from DataTables config
• Update all JavaScript that references these values