Wrap common API query parameters into shared class to deduplicate code

- Upgrade FastAPI to >= latest version. Required upgrade of FastAPI.
  Earlier version didn't support wrapping common query params in class

- Use per fixture app instead of a global FastAPI app in conftest

- Upgrade minimum required Django version

- Fix no notes chat director test with updated no notes message
  No notes message was updated in commit 118f1143

pyproject.toml

@@ -39,7 +39,7 @@ dependencies = [
     "bs4 >= 0.0.1",
     "dateparser >= 1.1.1",
     "defusedxml == 0.7.1",
-    "fastapi == 0.77.1",
+    "fastapi >= 0.104.1",
     "python-multipart >= 0.0.5",
     "jinja2 == 3.1.2",
     "openai >= 0.27.0, < 1.0.0",
@@ -60,7 +60,7 @@ dependencies = [
     "bs4 >= 0.0.1",
     "anyio == 3.7.1",
     "pymupdf >= 1.23.5",
-    "django == 4.2.5",
+    "django == 4.2.7",
     "authlib == 1.2.1",
     "gpt4all >= 2.0.0; platform_system == 'Linux' and platform_machine == 'x86_64'",
     "gpt4all >= 2.0.0; platform_system == 'Windows' or platform_system == 'Darwin'",