add coverage to XML parsing in NAP Monitoring

[mohamed-gougam]

Proposed changes

This adds coverage to NAP Monitoring extension in Agent for parsing additional cases of the XML Violations to gather the Context information and stream it to NGINX Management Suite.

Checklist

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• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• 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
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[olli-holmala]

I cross-referenced our list of scoped violations against the violations found in the ./test/component/nginx-app-protect/monitoring/testData/events-out directory and found that we are missing test cases for the following violations:

• VIOL_PARAMETER_REPEATED
• VIOL_PARAMETER_MULTIPART_NULL_VALUE
• VIOL_PARAMETER_EMPTY_VALUE
• VIOL_URL
• VIOL_PARAMETER_VALUE_REGEXP
• VIOL_PARAMETER_NUMERIC_VALUE
• VIOL_PARAMETER_DATA_TYPE
• VIOL_PARAMETER_VALUE_LENGTH
• VIOL_PARAMETER_DYNAMIC_VALUE
• VIOL_PARAMETER_STATIC_VALUE
• VIOL_COOKIE_EXPIRED
• VIOL_PARAMETER_ARRAY_VALUE
• VIOL_PARAMETER_LOCATION

Let's please add all the XML examples from our table there as test cases so we can demonstrate that we parse them correctly.

[sanathkumarbs]

Overall everything is LGTM. Thanks for extending the XML support!