Listener adjustment

[junaed-optimizely]

Summary

This pull request makes a small improvement to the DefaultNotificationCenter class by ensuring that listener removers are properly cleaned up after use.

• After calling a remover function for a listener, the corresponding entry is deleted from the removers map to prevent memory leaks and ensure accurate state tracking.

Test plan

Existing tests should pass

Issues

• "THING-1234" or "Fixes Fix(nodejs/event_dispatcher): update error/resp handlers #123"

[datadog-optimizely-experimentation]

⚠️ Warnings

🚦 1 Pipeline job failed

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[coveralls]

coverage: 77.631% (+0.001%) from 77.63% — junaed/listener-adjust into master