Resolve "Compile CTA using devtoolset-8 in CI"

.gitlab-ci.yml

catalogue/DbToSQLiteStatementTransformer.cpp

cmdline/restore_files/RestoreFilesCmd.cpp

...ion/buildtree_runner/vmBootstrap/InstallCTAEnvironment.md

...sintegration/buildtree_runner/vmBootstrap/bootstrapCTA.sh

...tegration/buildtree_runner/vmBootstrap/bootstrapSystem.sh

objectstore/RetrieveQueueShard.hpp

scheduler/Scheduler.cpp

tapeserver/castor/tape/tapeserver/SCSI/Structures.hpp

...rver/castor/tape/tapeserver/daemon/RecallTaskInjector.cpp

tapeserver/daemon/TestSubprocessHandlers.hpp

tapeserver/readtp/ReadtpCmd.cpp

tests/helgrind.suppr