fix: 🔧 changes early access notification channel from p4 to p5 …

…for dev and test servers (hacktoolkit#437)

## Description:
- Removes the explicit level `info` and uses the default level `debug`
for the early access notification.
- Default notification level:
https://github.com/hacktoolkit/django-htk/blob/a3043a0dc859282f35827bb1dbd2cd81fd17eec1/utils/notifications.py#L37-L39

apps/prelaunch/models/base.py

@@ -168,10 +168,8 @@ def grant_early_access(self):
         notify(
             'Early access has been enabled for {} <{}>'.format(
                 self.full_name, self.email
-            ),
-            level='info',
+            )
         )
-
         try:
             early_access_email(self)
         except Exception: