NIFI-10277 Refactor ConnectionLoadBalanceServerTest

[exceptionfactory]

Summary

NIFI-10277 Refactors the ConnectionLoadBalanceServerTest to use a dynamic available TCP port for the server instead of a static port. The new test includes methods for success and failure conditions.

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Build

• Build completed using mvn clean install -P contrib-check
  • JDK 8
  • JDK 11
  • JDK 17

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[joewitt]

ran local full clean build contrib check including full system test runs. all looking good. going to see how ci works out then merge. thanks