Remove the old request context API deprecated in 19.9. Use request.ctx instead. (#1801)

Co-authored-by: L. Kärkkäinen <tronic@users.noreply.github.com>

tests/test_request_data.py

@@ -44,44 +44,6 @@ def test_custom_context(app):
     }
 
 
-# Remove this once the deprecated API is abolished.
-def test_custom_context_old(app):
-    @app.middleware("request")
-    def store(request):
-        try:
-            request["foo"]
-        except KeyError:
-            pass
-        request["user"] = "sanic"
-        sidekick = request.get("sidekick", "tails")  # Item missing -> default
-        request["sidekick"] = sidekick
-        request["bar"] = request["sidekick"]
-        del request["sidekick"]
-
-    @app.route("/")
-    def handler(request):
-        return json(
-            {
-                "user": request.get("user"),
-                "sidekick": request.get("sidekick"),
-                "has_bar": "bar" in request,
-                "has_sidekick": "sidekick" in request,
-            }
-        )
-
-    request, response = app.test_client.get("/")
-
-    assert response.json == {
-        "user": "sanic",
-        "sidekick": None,
-        "has_bar": True,
-        "has_sidekick": False,
-    }
-    response_json = loads(response.text)
-    assert response_json["user"] == "sanic"
-    assert response_json.get("sidekick") is None
-
-
 def test_app_injection(app):
     expected = random.choice(range(0, 100))