ccl: add 23.2 version gate to regionless restore

This patch adds a >= 23.2 version gate to the `remove_regions`
RESTORE option, in addition to a mixed-version test to ensure
that RESTORE fails fast if it is on a cluster version < 23.32.

Epic: none
Fixes: cockroachdb#111348
Part of: https://cockroachlabs.atlassian.net/browse/CRDB-29129

Release note (sql change): Clusters with versions < 23.2 are not able to use
the RESTORE option `remove_regions` (this feature has been version
gated).

pkg/ccl/backupccl/datadriven_test.go

@@ -83,6 +83,8 @@ var localityCfgs = map[string]roachpb.Locality{
 var clusterVersionKeys = map[string]clusterversion.Key{
 	"23_1_Start":          clusterversion.V23_1Start,
 	"23_1_MVCCTombstones": clusterversion.V23_1_MVCCRangeTombstonesUnconditionallyEnabled,
+	"23_2_Start":          clusterversion.V23_2Start,
+	"23_2":                clusterversion.V23_2,
 }
 
 type sqlDBKey struct {

pkg/ccl/backupccl/restore_planning.go

@@ -1224,6 +1224,11 @@ func restorePlanHook(
 		return nil, nil, nil, false, err
 	}
 
+	if restoreStmt.Options.RemoveRegions && !p.ExecCfg().Settings.Version.IsActive(ctx, clusterversion.V23_2) {
+		return nil, nil, nil, false,
+			errors.Newf("to set the remove_regions option, cluster version must be >= %s", clusterversion.V23_2.String())
+	}
+
 	if !restoreStmt.Options.SchemaOnly && restoreStmt.Options.VerifyData {
 		return nil, nil, nil, false,
 			errors.New("to set the verify_backup_table_data option, the schema_only option must be set")

pkg/ccl/backupccl/testdata/backup-restore/restore-regionless-mixed-version

@@ -0,0 +1,59 @@
+new-cluster name=s1 beforeVersion=23_2_Start disable-tenant localities=us-east-1,us-west-1,eu-central-1
+----
+
+exec-sql
+CREATE DATABASE d PRIMARY REGION "us-east-1" REGIONS "us-west-1", "eu-central-1";
+CREATE TABLE d.t (x INT);
+INSERT INTO d.t VALUES (1), (2), (3);
+----
+
+query-sql
+SELECT region FROM [SHOW REGIONS FROM DATABASE d] ORDER BY 1;
+----
+eu-central-1
+us-east-1
+us-west-1
+
+query-sql
+SHOW DATABASES;
+----
+d root us-east-1  {eu-central-1,us-east-1,us-west-1} zone
+data root <nil> <nil> {} <nil>
+defaultdb root <nil> <nil> {} <nil>
+postgres root <nil> <nil> {} <nil>
+system node <nil> <nil> {} <nil>
+
+# backup a cluster
+exec-sql
+BACKUP INTO 'nodelocal://1/cluster_backup/';
+----
+
+new-cluster name=s2 beforeVersion=23_2_Start share-io-dir=s1 disable-tenant
+----
+
+# restore fails when cluster is in mixed version state while upgrading to 23.2
+exec-sql
+RESTORE FROM LATEST IN 'nodelocal://1/cluster_backup/' WITH remove_regions;
+----
+pq: to set the remove_regions option, cluster version must be >= 1000023.1-26
+
+# upgrade cluster
+upgrade-cluster version=23_2
+----
+
+exec-sql
+RESTORE DATABASE d FROM LATEST IN 'nodelocal://1/cluster_backup/' WITH remove_regions;
+----
+
+exec-sql
+INSERT INTO d.t VALUES (4), (5);
+----
+
+query-sql
+SELECT * FROM d.t
+----
+1
+2
+3
+4
+5