[2.26.x] Updated the CsvTransformer to remove attributes that have empty or nu…

[kcwire]

…ll values

What does this PR do?

Updates the CsvTransformer (which is used by the CsvMetacardTransformer and CsvQueryResponseTransformer to export results) to exclude empty or null values from the resulting csv file. It also updates the sorting order to be deterministic (alphabetical) when no columnOrder is provided.

How should this be tested?

Ingest some records. View the results in the table view to see there are multiple empty valued attributes, export the results as CSV to see those empty values are excluded from the csv file. Easiest way to to export CSV would be: https://localhost:8993/services/catalog/query?q=*&format=csv

Checklist:

• [ ] Documentation Updated
• [ ] Update / Add Threat Dragon models
• [X ] Update / Add Unit Tests
• [ ] Update / Add Integration Tests

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