refactor: fix static method warnings, hard-coded credentials, and Annotated type hints

- Add @staticmethod to 9 test methods in test_external_integrations.py
  that don't use self (PYL-R0201)
- Extract hard-coded password literals to constants in 6 test files
  to resolve S2068 warnings (fixtures_integration, test_imap_tasks,
  test_upload_tasks, test_upload_webdav_comprehensive,
  test_upload_webdav_integration, test_views_coverage)
- Migrate Form() dependency injection to Annotated type hints in
  dropbox.py, google_drive.py, onedrive.py (Sonar fastapi convention)

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_views_coverage.py

@@ -1,4 +1,5 @@
 """Additional view tests to increase coverage."""
+
 import pytest
 from unittest.mock import patch, MagicMock
 
@@ -33,7 +34,12 @@ class TestWizardPost:
         """Test POST wizard step 2."""
         response = client.post(
             "/setup",
-            data={"step": "2", "session_secret": "auto-generate", "admin_username": "admin", "admin_password": _TEST_CREDENTIAL},
+            data={
+                "step": "2",
+                "session_secret": "auto-generate",
+                "admin_username": "admin",
+                "admin_password": _TEST_CREDENTIAL,
+            },
             follow_redirects=False,
         )
         assert response.status_code in (200, 303)