feat: Added call to DistributeParticipant from ManageServiceNowParticipant function

[alex-clayton-1]

Description

• Added a call to DistributeParticipant function
• Added a call to SendServiceNowMessage function to notify ServiceNow of participant being added to cohort
• Marked some config properties as required

Context

DTOSS-10476

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[github-actions]

Unit Test Results

✔️ Tests 732 / 732 - passed in 12.9s
📝 Coverage 56.09%
📏 3932 / 6890 lines covered 🌿 931 / 1780 branches covered
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✏️ updated for commit a2f924c

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
91.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud