hinted handoff: use default timeout for sending orphaned hints
hinted handoff: use default timeout for sending orphaned hints

This patch causes orphaned hints (hints that were written towards a node
that is no longer their replica) to be sent with a default write
timeout. This is what is currently done for non-orphaned hints.

Previously, the timeout was hardcoded to one hour. This could cause a
long delay while shutting down, as hints manager waits until all ongoing
hint sending operation finish before stopping itself.

Fixes: #7051

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