tests: update tests to use httpx.AsyncClient (#3984)

* Add async support and dependencies to pyproject.toml files

- Added `asgi-lifespan>=2.1.0` to dependencies.
- Configured `asyncio_mode` and `asyncio_default_fixture_loop_scope` for pytest.
- Updated `tool.uv` section with `asgi-lifespan` in dev-dependencies.

* Convert test fixtures to async and use AsyncClient for HTTP requests

* Handle 'ImportFrom' nodes in AST validation to support module attribute imports

* Convert test cases to use async HTTP client

- Updated test cases in `test_database.py`, `test_endpoints.py`, `test_user.py`, `test_variable.py`, `test_files.py`, `test_chat_endpoint.py`, `test_misc.py`, `test_messages_endpoints.py`, `test_api_key.py`, `test_webhook.py`, and `test_login.py` to use `httpx.AsyncClient` instead of `fastapi.TestClient`.
- Modified test functions to be asynchronous and use `await` for HTTP requests.
- Adjusted fixtures and helper functions to support asynchronous operations.
- Ensured consistency in endpoint paths and request methods across all test cases.

* Refactor string concatenation to f-string in test_chat_endpoint.py

* [autofix.ci] apply automated fixes

* Refactor import validation to use pattern matching for AST nodes

* Set `startup_timeout` and `shutdown_timeout` to `None` in `LifespanManager` for test files.

* Convert test functions to async in `test_messages_endpoints.py`

* Add `api_key_required` marker to assistant component tests

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/tests/unit/test_api_key.py

@@ -1,44 +1,42 @@
 import pytest
+from httpx import AsyncClient
+
 from langflow.services.database.models.api_key import ApiKeyCreate
 
 
 @pytest.fixture
-def api_key(client, logged_in_headers, active_user):
+async def api_key(client, logged_in_headers, active_user):
     api_key = ApiKeyCreate(name="test-api-key")
 
-    response = client.post("api/v1/api_key", data=api_key.model_dump_json(), headers=logged_in_headers)
+    response = await client.post("api/v1/api_key/", data=api_key.model_dump_json(), headers=logged_in_headers)
     assert response.status_code == 200, response.text
     return response.json()
 
 
-def test_get_api_keys(client, logged_in_headers, api_key):
-    response = client.get("api/v1/api_key", headers=logged_in_headers)
+async def test_get_api_keys(client: AsyncClient, logged_in_headers, api_key):
+    response = await client.get("api/v1/api_key/", headers=logged_in_headers)
     assert response.status_code == 200, response.text
     data = response.json()
     assert "total_count" in data
     assert "user_id" in data
     assert "api_keys" in data
     assert any("test-api-key" in api_key["name"] for api_key in data["api_keys"])
-    # assert all api keys in data["api_keys"] are masked
     assert all("**" in api_key["api_key"] for api_key in data["api_keys"])
 
 
-def test_create_api_key(client, logged_in_headers):
+async def test_create_api_key(client: AsyncClient, logged_in_headers):
     api_key_name = "test-api-key"
-    response = client.post("api/v1/api_key", json={"name": api_key_name}, headers=logged_in_headers)
+    response = await client.post("api/v1/api_key/", json={"name": api_key_name}, headers=logged_in_headers)
     assert response.status_code == 200
     data = response.json()
     assert "name" in data and data["name"] == api_key_name
     assert "api_key" in data
-    # When creating the API key is returned which is
-    # the only time the API key is unmasked
     assert "**" not in data["api_key"]
 
 
-def test_delete_api_key(client, logged_in_headers, active_user, api_key):
-    # Assuming a function to create a test API key, returning the key ID
+async def test_delete_api_key(client, logged_in_headers, active_user, api_key):
     api_key_id = api_key["id"]
-    response = client.delete(f"api/v1/api_key/{api_key_id}", headers=logged_in_headers)
+    response = await client.delete(f"api/v1/api_key/{api_key_id}", headers=logged_in_headers)
     assert response.status_code == 200
     data = response.json()
     assert data["detail"] == "API Key deleted"