portico: Load medium-sized avatar in preview.

This commit is to use medium-size avatar images when previewing avatars during the copy account settings flow. Before this commit, the avatar images were blurry when using the avatar from an existing account while joining a new realm. Now, the avatar is clear.

Fixes #32604.

zerver/lib/users.py

@@ -487,12 +487,13 @@ def get_accounts_for_email(email: str) -> list[Account]:
         )
         .order_by("date_joined")
     )
+
     return [
         dict(
             realm_name=profile.realm.name,
             realm_id=profile.realm.id,
             full_name=profile.full_name,
-            avatar=avatar_url(profile),
+            avatar=avatar_url(profile, medium=True),
         )
         for profile in profiles
     ]

zerver/tests/test_users.py

@@ -1471,7 +1471,7 @@ class UserProfileTest(ZulipTestCase):
             for account in accounts:
                 realm = user.realm
                 if (
-                    account["avatar"] == avatar_url(user)
+                    account["avatar"] == avatar_url(user, medium=True)
                     and account["full_name"] == user.full_name
                     and account["realm_name"] == realm.name
                     and account["realm_id"] == realm.id