Improve readability of testReadMarkerCompatibility (#4759) #2098

Job	Run time
build-all	3m 25s
tests (scylla, -Pscylla-murmur -Dtest="*/diskstorage/cql/", murmur-diskstorage-java8, 8)	14m 44s
tests (scylla, -Pscylla-murmur -Dtest="*/graphdb/cql/", murmur-graphdb-java8, 8)	57m 28s
tests (scylla, -Pscylla-murmur -Dtest="*/hadoop/", murmur-hadoop-java8, 8)	11m 54s
tests (scylla, -Pscylla-murmur -Dtest="*/core/cql/", murmur-core-java8, 8)	4m 18s
tests (scylla, -Pscylla-murmur -Dtest="*/diskstorage/cql/", murmur-diskstorage, -Pjava-11, 11)	15m 11s
tests (scylla, -Pscylla-murmur -Dtest="*/graphdb/cql/", murmur-graphdb, -Pjava-11, 11)	57m 25s
tests (scylla, -Pscylla-murmur -Dtest="*/hadoop/", murmur-hadoop, -Pjava-11, 11)	11m 36s
tests (scylla, -Pscylla-murmur -Dtest="*/core/cql/", murmur-core, -Pjava-11, 11)	4m 4s
	3h 0m 5s

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