Add PMD UnusedNullCheckInEquals rule #1055

Job	Run time
Test on JDK 21	2m 22s
Build with no staging repository, using only central-released artifacts	2m 32s
Smoke Tests imqadmin @ Java 11	13s
Smoke Tests imqbridgemgr @ Java 11	11s
Smoke Tests imqbrokerd @ Java 11	12s
Smoke Tests imqcmd @ Java 11	11s
Smoke Tests imqdbmgr @ Java 11	20s
Smoke Tests imqobjmgr @ Java 11	10s
Smoke Tests imqusermgr @ Java 11	14s
Smoke Tests imqadmin @ Java 17	9s
Smoke Tests imqbridgemgr @ Java 17	20s
Smoke Tests imqbrokerd @ Java 17	14s
Smoke Tests imqcmd @ Java 17	18s
Smoke Tests imqdbmgr @ Java 17	14s
Smoke Tests imqobjmgr @ Java 17	15s
Smoke Tests imqusermgr @ Java 17	16s
Smoke Tests imqadmin @ Java 21	13s
Smoke Tests imqbridgemgr @ Java 21	12s
Smoke Tests imqbrokerd @ Java 21	11s
Smoke Tests imqcmd @ Java 21	11s
Smoke Tests imqdbmgr @ Java 21	11s
Smoke Tests imqobjmgr @ Java 21	14s
Smoke Tests imqusermgr @ Java 21	10s
Test MQCRT Library on ubuntu-latest/JDK 17	54s
Test MQCRT Library on ubuntu-latest/JDK 21	1m 11s
Test MQCRT Library on macos-latest/JDK 17	1m 32s
Test MQCRT Library on macos-latest/JDK 21	1m 33s
	14m 43s

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