chore: update release_nightly.yml and improve test stability

- Added a newline at the end of the release_nightly.yml file for consistency.
- Modified the pyleak_marker decorator in test_basic_prompting.py to disable blocking detection, reducing flaky test failures.
- Included additional optional dependencies (toolguard and fastmcp) in test_all_modules_importable.py to enhance module import checks.

Author: deon-sanchez

.github/workflows/release_nightly.yml

@@ -930,4 +930,4 @@ jobs:
   #     ref: ${{ inputs.nightly_tag_release }}
   #     release_type: main-ep
   #     push_to_registry: ${{ inputs.push_to_registry }}
-  #   secrets: inherit
+  #   secrets: inherit

src/backend/tests/integration/flows/test_basic_prompting.py

@@ -6,7 +6,12 @@
 from tests.integration.utils import pyleak_marker, run_flow
 
 
-@pyleak_marker()
+# Disable event-loop-block detection: the MCP StreamableHTTP session manager
+# started by the FastAPI lifespan (via the autouse `_start_app(client)` fixture)
+# initiates an anyio `try_connect` that can exceed pyleak's 0.2s blocking
+# threshold under load, producing flaky EventLoopBlockError. Same rationale as
+# tests/integration/components/inputs/test_chat_input.py.
+@pyleak_marker(blocking=False)
 async def test_simple_no_llm():
     graph = Graph()
     flow_input = graph.add_component(ChatInput())

src/backend/tests/unit/components/test_all_modules_importable.py

@@ -461,6 +461,10 @@ async def import_module_async(modname):
                         "lfx-openai",
                         "lfx-datastax",
                         "lfx-oracle",
+                        # ToolGuard Policies (lfx[toolguard]); runtime may also
+                        # need fastmcp which is a separate optional extra.
+                        "toolguard",
+                        "fastmcp",
                     ]
                 ):
                     return ("skipped", modname, "missing optional dependency")