Move some object initalization to class definition #1417

Job	Run time
Upload Event Payload	3s
default (LCG_101/x86_64-centos7-gcc11-opt)	26m 9s
g4units (dev3/x86_64-el9-gcc13-opt)	26m 19s
default (LCG_102/x86_64-centos9-gcc11-opt)	25m 50s
key4hep (/cvmfs/sw-nightlies.hsf.org/key4hep/)	51m 44s
default (LCG_104/x86_64-el9-gcc13-opt)	1h 4m 37s
non-shared (LCG_105/x86_64-centos7-gcc11-opt)	11m 18s
default (LCG_105/x86_64-ubuntu2204-gcc11-opt)	1h 2m 28s
default (dev3/x86_64-el9-gcc13-opt)	32m 51s
default (dev3/x86_64-el9-clang16-opt)	26m 27s
default (dev4/x86_64-el9-gcc13-opt)	32m 37s
	6h 0m 23s

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