This commit extends sytem.scylla_local table with an additional
key/value pair that can be used later in this patch series to
keep an information that `sl:driver` was already created. The purpose
of storing this information is to ensure that `sl:driver` is
not recreated after being intentionally removed.
A new mutation is included in `register_raft_pull_snapshot` to keep
`service_level_driver_created` in state machine shapshot, which is
required for proper propagation of the value when a new node is added
to the cluster.
Refs: scylladb/scylladb#24411
dd9b4c64d2