[cppcheck] Cleans up cppcheck errors

.cppcheck-suppressions.txt

catalogue/CMakeLists.txt

catalogue/DatabaseMetadataGetter.cpp

catalogue/RdbmsCatalogue.cpp

catalogue/SchemaCheckerResult.cpp

catalogue/SchemaSqlStatementsReader.cpp

catalogue/SchemaVersion.cpp

cmdline/CtaAdminCmdParse.hpp

common/dataStructures/DriveState.cpp

common/dataStructures/LifecycleTimings.cpp

common/json/test/TestObject.hpp

common/log/Logger.cpp

common/threading/ChildProcess.hpp

common/threading/SubProcess.cpp

disk/JSONDiskSystem.cpp

eos_grpc_client/GrpcClient.hpp

mediachanger/castorrmc/common/getconfent.c

mediachanger/castorrmc/rmc/rmc_smcsubr.c

objectstore/AgentReference.cpp

objectstore/ArchiveQueue.hpp