Agent Control release notes for v1.19.0

[agent-control-app]

Automated PR: Agent Control release notes for v1.19.0.

[github-actions]

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[CLAassistant]

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[adutta-newrelic]

Contacted the #help-agent-control team over slack, here is the conversation https://newrelic.slack.com/archives/C084EDJFAF8/p1788515671297249

[adutta-newrelic]

This is a test PR as mentioned here: https://newrelic.slack.com/archives/C084EDJFAF8/p1788515781164179?thread_ts=1788515671.297249&cid=C084EDJFAF8