repair: Kill bunch of global usages from insert_repair_meta
repair: Kill bunch of global usages from insert_repair_meta

The insert_repair_meta needs to peek global proxy to get db from,
migration_manager to call get_schema_for_write(), global messaging
to pass it as argument to the mentioned call and to construct
the repair_meta.

All three can be obtained from repair-service which's now passed
there as argument.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla