✅(app-desk) change backend settings for e2e tests

When we run e2e tests with the CI, we are doing lot of
calls to the backend in a short amount of time. This can
lead to a rate limit particulary on the "user/me" endpoint.
To avoid this, we will use different backend settings
for the e2e tests.

src/backend/people/settings.py

@@ -228,7 +228,18 @@ class Base(Configuration):
         "PAGE_SIZE": 20,
         "DEFAULT_VERSIONING_CLASS": "rest_framework.versioning.URLPathVersioning",
         "DEFAULT_SCHEMA_CLASS": "drf_spectacular.openapi.AutoSchema",
-        "DEFAULT_THROTTLE_RATES": {"sustained": "150/hour", "burst": "20/minute"},
+        "DEFAULT_THROTTLE_RATES": {
+            "sustained": values.Value(
+                default="150/hour",
+                environ_name="SUSTAINED_THROTTLE_RATES",
+                environ_prefix=None,
+            ),
+            "burst": values.Value(
+                default="20/minute",
+                environ_name="BURST_THROTTLE_RATES",
+                environ_prefix=None,
+            ),
+        },
     }
 
     SPECTACULAR_SETTINGS = {