tests: Introduce mutation_partition_assertions
tests: Introduce mutation_partition_assertions

mutation_assertions are now delegating to mutation_partition_assertions.

avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,duarten/scylla,scylladb/scylla,duarten/scylla,scylladb/scylla