remote-activity: Add column for remote server or realm creation date.

Expands the main query for remote servers to get the audit log
event datetime for when the server was created/registered.

The remote realm object has a field for when the remote realm
was created on the remote server.

corporate/lib/activity.py

@@ -101,6 +101,10 @@ def format_optional_datetime(date: Optional[datetime], display_none: bool = Fals
         return ""
 
 
+def format_datetime_as_date(date: datetime) -> str:
+    return date.strftime("%Y-%m-%d")
+
+
 def format_none_as_zero(value: Optional[int]) -> int:
     if value:
         return value