gui_e2e: remove warning when executing tests

A pytext fixture cannot be marked with another fixture. Pytest warns
about this error like so:

```
.venv/lib/python3.12/site-packages/_pytest/fixtures.py:1313
  /home/solomonjacobs/g/check_mk/.venv/lib/python3.12/site-packages/_pytest/fixtures.py:1313: PytestRemovedIn9Warning: Marks applied to fixtures have no effect
  See docs: https://docs.pytest.org/en/stable/deprecations.html#applying-a-mark-to-a-fixture-function
    return fixture_marker(fixture_function)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
```

Change-Id: Iac15b5a071967e396842e1bf36c07791196d482f

Author: SoloJacobs

tests/gui_e2e/conftest.py

@@ -115,7 +115,6 @@ def _navigate_to_dashboard(
 
 
 @pytest.fixture(name="new_browser_context_and_page")
-@pytest.mark.browser_context_args
 def fixture_new_browser_context_and_page(
     context: BrowserContext,
 ) -> Iterator[tuple[BrowserContext, Page]]:

tests/gui_e2e/testlib/playwright/plugin.py

@@ -54,7 +54,6 @@ def fixture_browser_storage_stage() -> StorageState:
 
 
 @pytest.fixture
-@pytest.mark.browser_context_args
 def cmk_page(
     new_context: CreateContextCallback, browser_storage_state: StorageState
 ) -> Iterator[Page]: