misc: Separate tests folder from backend code

Create separate `tests/` folder for all tests. This will also simplify
not copying tests code into the Docker image.

backend/endpoints/sockets/tests/conftest.py

@@ -1,7 +0,0 @@
-from handler.tests.conftest import (  # noqa
-    admin_user,
-    clear_database,
-    platform,
-    rom,
-    setup_database,
-)

backend/handler/auth/tests/conftest.py

@@ -1,7 +0,0 @@
-from handler.tests.conftest import (  # noqa
-    admin_user,
-    clear_database,
-    editor_user,
-    setup_database,
-    viewer_user,
-)

backend/handler/filesystem/tests/conftest.py

@@ -1,6 +0,0 @@
-from handler.tests.conftest import (  # noqa
-    admin_user,
-    clear_database,
-    editor_user,
-    setup_database,
-)

backend/models/tests/conftest.py

@@ -1,12 +0,0 @@
-from handler.tests.conftest import (  # noqa
-    admin_user,
-    clear_database,
-    editor_user,
-    platform,
-    rom,
-    save,
-    screenshot,
-    setup_database,
-    state,
-    viewer_user,
-)

backend/pytest.ini

@@ -1,5 +1,6 @@
 [pytest]
 asyncio_mode = auto
+testpaths = tests
 env =
    ROMM_BASE_PATH=romm_test
    DB_NAME=romm_test

backend/tests/endpoints/conftest.py

@@ -1,20 +1,8 @@
 from datetime import timedelta
 
 import pytest
+from endpoints.auth import ACCESS_TOKEN_EXPIRE_MINUTES, REFRESH_TOKEN_EXPIRE_DAYS
 from handler.auth import oauth_handler
-from handler.tests.conftest import (  # noqa
-    admin_user,
-    clear_database,
-    editor_user,
-    platform,
-    rom,
-    save,
-    setup_database,
-    state,
-    viewer_user,
-)
-
-from ..auth import ACCESS_TOKEN_EXPIRE_MINUTES, REFRESH_TOKEN_EXPIRE_DAYS
 
 
 @pytest.fixture()