Add quota_bytes field to user serialization in API

The value in bytes is more useful to control the final representation

lib/galaxy/managers/users.py

@@ -389,6 +389,9 @@ def quota(self, user, total=False):
             return self.app.quota_agent.get_quota_nice_size(user)
         return self.app.quota_agent.get_percent(user=user)
 
+    def quota_bytes(self, user):
+        return self.app.quota_agent.get_quota(user=user)
+
     def tags_used(self, user, tag_models=None):
         """
         Return a list of distinct 'user_tname:user_value' strings that the
@@ -618,6 +621,7 @@ def __init__(self, app: MinimalManagerApp):
             'nice_total_disk_usage',
             'quota_percent',
             'quota',
+            'quota_bytes',
             'deleted',
             'purged',
             # 'active',
@@ -644,6 +648,7 @@ def add_serializers(self):
             'total_disk_usage': lambda i, k, **c: float(i.total_disk_usage),
             'quota_percent': lambda i, k, **c: self.user_manager.quota(i),
             'quota': lambda i, k, **c: self.user_manager.quota(i, total=True),
+            'quota_bytes': lambda i, k, **c: self.user_manager.quota_bytes(i),
 
             'tags_used': lambda i, k, **c: self.user_manager.tags_used(i),
         })