chore(key-value): use json serialization for main resources (#23888)

tests/integration_tests/explore/permalink/api_tests.py

@@ -15,7 +15,6 @@
 # specific language governing permissions and limitations
 # under the License.
 import json
-import pickle
 from typing import Any, Dict, Iterator
 from uuid import uuid3
 
@@ -24,7 +23,7 @@ from sqlalchemy.orm import Session
 
 from superset import db
 from superset.key_value.models import KeyValueEntry
-from superset.key_value.types import KeyValueResource
+from superset.key_value.types import JsonKeyValueCodec, KeyValueResource
 from superset.key_value.utils import decode_permalink_id, encode_permalink_key
 from superset.models.slice import Slice
 from superset.utils.core import DatasourceType
@@ -95,7 +94,7 @@ def test_get_missing_chart(
     chart_id = 1234
     entry = KeyValueEntry(
         resource=KeyValueResource.EXPLORE_PERMALINK,
-        value=pickle.dumps(
+        value=JsonKeyValueCodec().encode(
             {
                 "chartId": chart_id,
                 "datasourceId": chart.datasource.id,