[NDM] Fix for ignored_ip_addresses in autodiscovery #30180
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What does this PR do?
Adds fix and unit test for a bug that currently exists in the NDM Autodiscovery Listener.
Motivation
When adding ignored_ip_addresses to the NDM Autodiscovery config in datadog.yaml, the SNMP Listener fails to start and no error is logged.
Describe how to test/QA your changes
Unit test included in PR
Possible Drawbacks / Trade-offs
None
Additional Notes
Related issue: #30181
Unit test showing original unmarshal bug: #30177