fix: regression in fixture order with pytest-django

[NyanKiyoshi]

Since v1.3.0rc1, the db fixture from pytest-django may be only initialized after the fixture count_queries is loaded thus leading to such errors:

______________________________________________ ERROR at setup of test_index_page ______________________________________________

request = <SubRequest '_pytest_query_marker' for <Function test_index_page>>

    @pytest.fixture(autouse=True)
    def _pytest_query_marker(request):
        """Use the fixture to count the queries on the current node if it's
        marked with 'count_queries'.

        Optional keyword-arguments:
            - autouse (bool, default: True)
              Whether the fixture should be used automatically.
              This might be useful if you are executing fixtures
              that are making queries and still want to mark the test
              but place the fixture manually."""
        marker = request.node.get_closest_marker(PYTEST_QUERY_COUNT_MARKER)
        if marker:
>           _process_query_count_marker(request, *marker.args, **marker.kwargs)

../src/pytest_django_queries/plugin.py:142:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
../src/pytest_django_queries/plugin.py:126: in _process_query_count_marker
    request.getfixturevalue(PYTEST_QUERY_COUNT_FIXTURE_NAME)
../src/pytest_django_queries/plugin.py:207: in count_queries
    with CaptureQueriesContext(connection) as context:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <django.test.utils.CaptureQueriesContext object at 0x7f65bc991b20>

    def __enter__(self):
        self.force_debug_cursor = self.connection.force_debug_cursor
        self.connection.force_debug_cursor = True
        # Run any initialization queries if needed so that they won't be
        # included as part of the count.
>       self.connection.ensure_connection()
E       RuntimeError: Database access not allowed, use the "django_db" mark, or the "db" or "transactional_db" fixtures to enable it.

This fixes the issue by no longer assuming db fixture is loaded first. This assumption was likely accidental and adding official support for pytest ≥ 7.2.0 may only have surfaced the bug.

Additionally, this commit fixes example not being in the PATH by default.

Changes Checklist

• The changes were tested (manually)
• The changes are tested automatically (pytest)
• The changes are optimized and clean
• The changes are documented:
  • The code is documented
  • The readme is up to date
  • The documentation (readthedocs) is up to date and tested