fix(backend): Fix graph fetching of non-owned marketplace agent (#10110)

Currently, the get_graph function, with no graph version specifier will
try to fetch the latest version, and when the graph is not owned and the
latest version is not available for listing, it will return `None`
instead of picking the latest graph version available on the store.

### Changes 🏗️

Instead of using the latest graph.version to fetch the store listing,
don't provide any version filter at all and pick up whatever available
version in the store.

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  <!-- Put your test plan here: -->
  - [x] CI, existing tests

autogpt_platform/backend/backend/data/graph.py

@@ -12,6 +12,7 @@ from prisma.types import (
     AgentGraphWhereInput,
     AgentNodeCreateInput,
     AgentNodeLinkCreateInput,
+    StoreListingVersionWhereInput,
 )
 from pydantic import create_model
 from pydantic.fields import computed_field
@@ -712,23 +713,24 @@ async def get_graph(
         include=AGENT_GRAPH_INCLUDE,
         order={"version": "desc"},
     )
-
-    # For access, the graph must be owned by the user or listed in the store
-    if graph is None or (
-        graph.userId != user_id
-        and not (
-            await StoreListingVersion.prisma().find_first(
-                where={
-                    "agentGraphId": graph_id,
-                    "agentGraphVersion": version or graph.version,
-                    "isDeleted": False,
-                    "submissionStatus": SubmissionStatus.APPROVED,
-                }
-            )
-        )
-    ):
+    if graph is None:
         return None
 
+    if graph.userId != user_id:
+        store_listing_filter: StoreListingVersionWhereInput = {
+            "agentGraphId": graph_id,
+            "isDeleted": False,
+            "submissionStatus": SubmissionStatus.APPROVED,
+        }
+        if version is not None:
+            store_listing_filter["agentGraphVersion"] = version
+
+        # For access, the graph must be owned by the user or listed in the store
+        if not await StoreListingVersion.prisma().find_first(
+            where=store_listing_filter, order={"agentGraphVersion": "desc"}
+        ):
+            return None
+
     if include_subgraphs or for_export:
         sub_graphs = await get_sub_graphs(graph)
         return GraphModel.from_db(