Describe the bug
When using Authentik as a HTTP proxy, the X-Authentik-Groups header only includes the groups the current user is a direct member of. Groups which are a parent to any groups they belong to are not listed in the header.

To Reproduce

1. Create a group called foo
2. Create a group called admin
3. Set the admin group's parent to be group foo
4. set your user to be a member of admin and ensure you are not a direct member of foo
5. clear all cookies (to force a clean auth state) and login again
6. use a service like whoami to see the HTTP headers authentik is forwarding to the backend http service.
7. Observe the X-Authentik-Groups header only contains the group admin, and does not contain foo.

Expected behavior
The X-Authentik-Groups header should contain admin and foo.

According to the Authentik Groups Documentation, groups which have a parent group inherit their parent's privileges as well. Which should also be reflected on the X-Authentik-Groups http header so that HTTP services that check for group membership can see the full list of groups a member belongs to.

Version and Deployment (please complete the following information):

• authentik version: 2023.5.4
• Deployment: docker-compose