Update the service level cache in the node startup sequence, after the
service level and auth service are initialized.
The cache update depends on the service level data accessor being set
and the auth service being initialized. Before the commit, it may happen that a
cache update is not triggered after the initialization. The commit adds
an explicit call to update the cache where it is guaranteed to be ready.
Fixes scylladb/scylladb#21763
Closes scylladb/scylladb#21773
(cherry picked from commit 373855b493)
Closes scylladb/scylladb#21893