linux

Introduce `MaybeSharedPtr` for managing user facing objects #1478

Job	Run time
build-and-test (dev3/x86_64-el9-clang16-opt, 20, ON)	16m 36s
build-and-test (dev4/x86_64-el9-clang16-opt, 20, ON)	13m 29s
build-and-test (dev4/x86_64-centos7-gcc11-opt, 17)	15m 41s
build-and-test (LCG_102/x86_64-centos7-clang12-opt, OFF, 17)	16m 28s
build-and-test (LCG_102/x86_64-centos8-gcc11-opt, OFF, 17)	10m 36s
	1h 12m 50s

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