backup: fix flaky OR recovery test

OR recovery test was flaking due to an insufficient timeout and also ran
into errors due to the default database being set offline. This patch
fixes the test to account for these errors.

Epic: CRDB-51394

Fixes: #148424

Release note: None

Author: kev-cao

pkg/cmd/roachtest/tests/backup_restore_roundtrip.go

@@ -539,6 +539,12 @@ func testOnlineRestoreRecovery(ctx context.Context, t test.Test, c cluster.Clust
 			)
 		}
 
+		// defaultdb is going to be set offline by the failed download job, so we
+		// need to switch to the system database first to avoid any errors.
+		if _, err := dbConn.ExecContext(ctx, "USE system"); err != nil {
+			return err
+		}
+
 		if _, err := dbConn.ExecContext(
 			ctx, "SET CLUSTER SETTING jobs.debug.pausepoints = ''",
 		); err != nil {
@@ -558,7 +564,7 @@ func testOnlineRestoreRecovery(ctx context.Context, t test.Test, c cluster.Clust
 				err, "waiting for download job %v to reach resumed state", downloadJobID,
 			)
 		}
-		if err := WaitForFailed(ctx, dbConn, jobspb.JobID(downloadJobID), jobStatusWait); err != nil {
+		if err := WaitForFailed(ctx, dbConn, jobspb.JobID(downloadJobID), 10*time.Minute); err != nil {
 			return errors.Wrapf(
 				err, "waiting for download job %v to reach failed state", downloadJobID,
 			)