NIFI-10312 - Fix MiNiFi C2 integration

[rliszli]

Summary

This change fix the communication between the MiNiFi and the C2 Service trough C2 protocol. Also covered the heartbeating and flow update with integration tests.

NIFI-10312

Tracking

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Issue Tracking

• [x] Apache NiFi Jira issue created

Pull Request Tracking

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• [x] Pull Request commit message starts with Apache NiFi Jira issue number, as such NIFI-00000

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