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This series adds moving sstables uploaded via `nodetool refresh` to
staging/ directory if they require generating view updates from them.
Previous behavior (leaving these sstables in upload/ directory until
view updates are generated) might have caused sstables with
conflicting names to be mistakenly overwritten by the user.
Fixes#4047
Tests: unit (dev)
dtest: backup_restore_tests.py + backup_restore_tests.py modified with
having materialized view definitions
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* 'use_staging_directory_for_uploaded_sstables_awaiting_view_updates' of https://github.com/psarna/scylla:
sstables: simplify requires_view_building
loader: move uploaded view pending sstables to staging