test: disable pmempool_sync/TEST18 until #5708 is fixed #284

Job	Run time
Basic build	2m 7s
Source checkers	52s
CentOS / CentOS (OS_VER=7 FAULT_INJECTION=1 TEST_BUILD=debug)	19m 33s
CentOS / CentOS (OS_VER=7 TEST_BUILD=nondebug)	17m 1s
CentOS / CentOS (OS_VER=7 TEST_BUILD=debug NDCTL_ENABLE=n)	21m 36s
CentOS / CentOS (OS_VER=7 TEST_BUILD=nondebug NDCTL_ENABLE=n)	16m 49s
CentOS / CentOS (OS_VER=stream TEST_BUILD=debug)	24m 47s
CentOS / CentOS (OS_VER=stream FAULT_INJECTION=1 TEST_BUILD=debug)	20m 1s
CentOS / CentOS (OS_VER=stream TEST_BUILD=nondebug)	20m 17s
Ubuntu / Linux (N=1 OS=ubuntu OS_VER=22.04 FAULT_INJECTION=1 TEST_BUILD=debug)	26m 53s
Ubuntu / Linux (N=2 OS=ubuntu OS_VER=22.04 FAULT_INJECTION=1 TEST_BUILD=nondebug UBSAN=1)	21m 45s
Ubuntu / Linux (N=3 OS=ubuntu OS_VER=22.04 PMDK_CC=clang PMDK_CXX=clang++ TEST_BUILD=debug)	21m 18s
Ubuntu / Linux (N=4 OS=ubuntu OS_VER=22.04 PMDK_CC=clang PMDK_CXX=clang++ TEST_BUILD=nondebug AUTO_DOC_UPD...	19m 41s
Ubuntu / Linux (N=5 OS=ubuntu OS_VER=22.04 COVERAGE=1 FAULT_INJECTION=1 TEST_BUILD=debug)	19m 37s
	4h 12m 17s

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