cmd: add integration test for rollback functionality (backport #7315) (#7368)

* cmd: add integration test and fix bug in rollback command (#7315)

(cherry picked from commit bca2080c01)

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

state/store.go

@@ -68,6 +68,8 @@ type Store interface {
 	Bootstrap(State) error
 	// PruneStates takes the height from which to start prning and which height stop at
 	PruneStates(int64, int64) error
+	// Close closes the connection with the database
+	Close() error
 }
 
 // dbStore wraps a db (github.com/tendermint/tm-db)
@@ -593,3 +595,7 @@ func (store dbStore) saveConsensusParamsInfo(nextHeight, changeHeight int64, par
 
 	return nil
 }
+
+func (store dbStore) Close() error {
+	return store.db.Close()
+}