fix: split subviolations and tc by comma

[sanathkumarbs]

Proposed changes

It was identified that the Threat Campaign and Subviolation values were incorrectly sent as encoded values, whereas it was expected to be comma-delimited.

This PR fixes the Threat Campaign and Subviolation values to be sent as comma-delimited strings.

Testing:

• Manually tested
• Updated test cases

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)

[Laks28]

Tested the changes, able to filter by Subviolations.