fix(tests): Remove MCP conftest.py to fix session event loop conflict

The MCP conftest.py with pytest hooks (pytest_addoption,
pytest_collection_modifyitems) was disrupting pytest-asyncio's session
event loop lifecycle, causing the SpinTestServer to be torn down before
session-scoped oauth tests could run.

Replace the conftest-based e2e gating with a simple pytestmark skipif
in the test file itself.

autogpt_platform/backend/backend/blocks/mcp/conftest.py

@@ -1,29 +0,0 @@
-"""
-Conftest for MCP block tests.
-
-Registers the e2e marker and --run-e2e CLI option so MCP end-to-end tests
-(which hit real external servers) can be gated behind a flag.
-"""
-
-import pytest
-
-
-def pytest_configure(config: pytest.Config) -> None:
-    config.addinivalue_line("markers", "e2e: end-to-end tests requiring network")
-
-
-def pytest_collection_modifyitems(
-    config: pytest.Config, items: list[pytest.Item]
-) -> None:
-    """Skip e2e tests unless --run-e2e is passed."""
-    if not config.getoption("--run-e2e", default=False):
-        skip_e2e = pytest.mark.skip(reason="need --run-e2e option to run")
-        for item in items:
-            if "e2e" in item.keywords:
-                item.add_marker(skip_e2e)
-
-
-def pytest_addoption(parser: pytest.Parser) -> None:
-    parser.addoption(
-        "--run-e2e", action="store_true", default=False, help="run e2e tests"
-    )

autogpt_platform/backend/backend/blocks/mcp/test_e2e.py

@@ -9,6 +9,7 @@ independently of the rest of the test suite (they require network access).
 """
 
 import json
+import os
 
 import pytest
 
@@ -17,8 +18,12 @@ from backend.blocks.mcp.client import MCPClient
 # Public MCP server that requires no authentication
 OPENAI_DOCS_MCP_URL = "https://developers.openai.com/mcp"
 
+# Skip all tests in this module unless RUN_E2E env var is set
+pytestmark = pytest.mark.skipif(
+    not os.environ.get("RUN_E2E"), reason="set RUN_E2E=1 to run e2e tests"
+)
+
 
-@pytest.mark.e2e
 class TestRealMCPServer:
     """Tests against the live OpenAI docs MCP server."""