Do pause longer for cluster migration finalization process

[BorysTheDev]

if the pause is failed the migration will not finish or will be finished with data loss, so we need to consider several options or mix of these options:

1. make a longer pause, for example 10 seconds. Less chance that migration finalization will fail
2. increase pause after every migration finalization fails. Better instance availability if huge requests are not often
3. force finish of migration process with data loss.