[2.5] Backport mocked HostResolver from KAFKA-12193 to avoid relying on kafka.apache.org for specific DNS behavior - #10058
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…ka.apache.org for specific DNS behavior.
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The original PR was #9902
The reason for back-porting this improved test infrastructure is to address some flakes which we have seen when kafka.apache.org DNS changes, specifically in the ClusterConnectionStatesTest. This change uses a mocked resolver for the multi-ip tests.
Related PR: #10055 #10057