This is to ensure, once all the opamp-client pieces are in place, that we don't send repeated messages to the server. Based on [this discussion](https://github.com/open-telemetry/opentelemetry-java-contrib/pull/1928#discussion_r2138029016).
This is to ensure, once all the opamp-client pieces are in place, that we don't send repeated messages to the server. Based on this discussion.