Add type hints to all test code (#1217)

* Add type hints to all test code

* Fixes

* Fix indentation

* Review fixes

tests/typecheck/db/test_transaction.yml

@@ -12,10 +12,12 @@
       reveal_type(func)  # N: Revealed type is "def (x: builtins.int) -> builtins.list[Any]"
 -   case: non_atomic_requests_bare
     main: |
+      from typing import Any
       from django.db.transaction import non_atomic_requests
+      from django.http import HttpRequest, HttpResponse
       @non_atomic_requests
-      def view_func(request): ...
-      reveal_type(view_func)  # N: Revealed type is "def (request: Any) -> Any"
+      def view_func(request: HttpRequest) -> HttpResponse: ...
+      reveal_type(view_func)  # N: Revealed type is "def (request: django.http.request.HttpRequest) -> django.http.response.HttpResponse"
 
 -   case: non_atomic_requests_args
     main: |