chore(schema-v13): Fix `periodConfig.Validate` for `v13` schema (#10336)

**What this PR does / why we need it**:
Fix periodConfigs `Validate()` for new schema `v13`.

**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:
Found when testing archiver with latest loki
**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)

Signed-off-by: Kaviraj <kavirajkanagaraj@gmail.com>

pkg/storage/config/schema_config.go

@@ -430,7 +430,7 @@ func (cfg PeriodConfig) validate() error {
 	}
 
 	switch v {
-	case 10, 11, 12:
+	case 10, 11, 12, 13:
 		if cfg.RowShards == 0 {
 			return fmt.Errorf("must have row_shards > 0 (current: %d) for schema (%s)", cfg.RowShards, cfg.Schema)
 		}

pkg/storage/config/schema_config_test.go

@@ -427,6 +427,15 @@ func TestPeriodConfig_Validate(t *testing.T) {
 				ChunkTables: PeriodicTableConfig{Period: 0},
 			},
 		},
+		{
+			desc: "v13",
+			in: PeriodConfig{
+				Schema:      "v13",
+				RowShards:   16,
+				IndexTables: PeriodicTableConfig{Period: 0},
+				ChunkTables: PeriodicTableConfig{Period: 0},
+			},
+		},
 	} {
 		t.Run(tc.desc, func(t *testing.T) {
 			if tc.err == "" {
@@ -555,6 +564,19 @@ func TestVersionAsInt(t *testing.T) {
 			},
 			expected: int(12),
 		},
+		{
+			name: "v13",
+			schemaCfg: SchemaConfig{
+				Configs: []PeriodConfig{
+					{
+						From:      DayTime{Time: 0},
+						Schema:    "v13",
+						RowShards: 16,
+					},
+				},
+			},
+			expected: int(13),
+		},
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			version, err := tc.schemaCfg.Configs[0].VersionAsInt()