Test charm recovery after instance restart.

[BON4]

Functional tests for testing successful recovery from graceful and forceful instance restart.

Test cases

1. Graceful restart. Write data, graceful restart instance.
2. Forceful restart. Write data, forceful restart instance (recovery).
3. Backup-restore case with recovery. Write data, create backup, forceful restart, run recovery, write data, run backup, check data consistency.

[github-actions]

https://warthogs.atlassian.net/browse/DPE-4290