Remove Ponos from CE

Based on !2227 (merged)

TODO:

• Remove & update tests

arkindex/project/checks.py

@@ -78,23 +78,6 @@ def local_imageserver_check(*args, **kwargs):
     return []
 
 
-@register()
-@only_runserver
-def ponos_key_check(*args, **kwargs):
-    """
-    Warn about a missing Ponos private key that would prevent any Ponos agent from authenticating
-    """
-    from django.conf import settings
-    if not os.path.exists(settings.PONOS_PRIVATE_KEY):
-        return [Warning(
-            f"Ponos private key at {settings.PONOS_PRIVATE_KEY} not found. "
-            "Agents will be unable to connect to this server.",
-            hint=f"`ponos.private_key` in {settings.CONFIG_PATH}",
-            id="arkindex.W007",
-        )]
-    return []
-
-
 @register()
 def ponos_env_check(*args, **kwargs):
     """