chore: rename `bucket_count` to `shard_count` in public interface

Summary

• chore: rename bucket_count to shard_count in public interface

Signed-off-by: Anatoly Popov a.popov@picodata.io

---

• Close #1391 (closed)
• Cherry-pick to: none
• Docs follow-up: docs#467 (closed)
• Changelog is updated
• Follow-up for !1653 (merged)

test/int/test_http_server.py

@@ -67,7 +67,7 @@ def test_webui_basic(instance: Instance):
                 ],
                 "replicasetCount": 1,
                 "rf": 1,
-                "bucketCount": 3000,
+                "shardCount": 3000,
                 "instanceCount": 1,
                 "can_vote": True,
                 "name": "default",
@@ -203,7 +203,7 @@ def test_webui_with_plugin(cluster: Cluster):
     tier_template = {
         "replicasetCount": 1,
         "rf": 1,
-        "bucketCount": 3000,
+        "shardCount": 3000,
         "instanceCount": 1,
         "can_vote": True,
     }