feat(backend): add typechecking with ty (#9664)

* Add ty for type checking

* fix various typing issues

* fix req

* more fixes

* and more types

* and more typing

* fix imports

* more fixes

* fix types and optional statements

* ensure patch only runs if it is installed

* add type check to qc

* more fixes

* install all reqs

* fix more types

* more fixes

* disable container stuff for now

* move typecheck to seperate job

* try to use putput for path

* use env instead

* fix typo

* add missing install

* remove unclear imports - not sure why this was done

* add kwarg names

* fix introduced issue in url call

* ignore import

* fix broken typing changes

* fix filter import

* reduce change set

* remove api-change

* fix dict

* ignore typing errors

* fix more type issues

* ignore errors

* style fix

* fix type

* bump ty

* fix more

* type fixes

* update ignores

* fix import

* fix defaults

* fix ignore

* fix some issues

* fix type

docs/docs/hooks.py

@@ -4,7 +4,7 @@ import json
 import os
 import re
 from datetime import datetime
-from distutils.version import StrictVersion
+from distutils.version import StrictVersion  # type: ignore[import]
 from pathlib import Path
 
 import requests

docs/main.py

@@ -126,7 +126,7 @@ def check_link(url) -> bool:
     return False
 
 
-def get_build_environment() -> str:
+def get_build_environment() -> Optional[str]:
     """Returns the branch we are currently building on, based on the environment variables of the various CI platforms."""
     # Check if we are in ReadTheDocs
     if os.environ.get('READTHEDOCS') == 'True':