DAOS-16251 tests: Fix various memory issues (#15147) #6813

Job	Run time
Build DAOS (alma.8)	38m 38s
Build DAOS (ARM64) (ubuntu, clang)	37m 51s
Build DAOS (alma.9)	39m 32s
Create Docker images (ubuntu)	8m 36s
Build DAOS (rocky.8)	39m 30s
Build DAOS (ARM64) (alma.8, clang)	37m 34s
Create Docker images (rocky)	10m 14s
Build DAOS (ubuntu)	9m 46s
Build DAOS (ARM64) (leap.15, clang)	36m 32s
Create Docker images (fedora)	9m 42s
Create Docker images (leap.15)	12m 25s
Run DAOS/NLT tests (ubuntu)	25m 33s
Build DAOS in image (ubuntu, clang)	21m 37s
Build DAOS in image (ubuntu, gcc)	22m 51s
Build DAOS in image (rocky, clang)	24m 40s
Build DAOS in image (rocky, gcc)	25m 29s
Build DAOS in image (fedora, clang)	22m 34s
Build DAOS in image (fedora, gcc)	26m 29s
Build DAOS in image (leap.15, clang)	25m 23s
Build DAOS in image (leap.15, gcc)	25m 32s
	8h 20m 28s

Provide feedback