Automated snippet conversion by scripts

These changes are purely mechanical to differentiate them from manual
fixes/adjustments made in the next commit.
This results in broken code as some snippets contain errors.

Made in four steps:
1. Run ./migrate-snippet.py that converts `.md` files to code files
   and perhaps adds missing lines under `// @hide` comments.
2. Sort Java imports.
3. Remove old `.md` files.
4. Run ./generate.md to produce `*/generated/*.md` files.

qdrant-landing/content/documentation/headless/snippets/insert-points/with-tenant-group-id/python.py

@@ -0,0 +1,24 @@
+from qdrant_client import QdrantClient, models  # @hide
+
+client = QdrantClient(url="http://localhost:6333")  # @hide
+
+client.upsert(
+    collection_name="{collection_name}",
+    points=[
+        models.PointStruct(
+            id=1,
+            payload={"group_id": "user_1"},
+            vector=[0.9, 0.1, 0.1],
+        ),
+        models.PointStruct(
+            id=2,
+            payload={"group_id": "user_1"},
+            vector=[0.1, 0.9, 0.1],
+        ),
+        models.PointStruct(
+            id=3,
+            payload={"group_id": "user_2"},
+            vector=[0.1, 0.1, 0.9],
+        ),
+    ],
+)