User group tree not working with Accounts feature enabled

[nunoaguiar]

Is your feature request related to a problem? Please describe.
When the feature flag "Enable user account functionality" is enabled, the user groups tree does not go past 1 level deep.
It should be possible to use the subgroups (that are not of type accounts) regardless of the feature flag being enabled

Repro steps

• Ensure "Enable user account functionality" is disabled
• Create 3 or more level of user groups. For example
  • A
    • A-1
    • A-1-1
• Enable "Enable user account functionality"
• Go back to Users
• The tree does not render subgroups now - but you can get to subgroups using the "List subgroups" feature
• However, there is no way to ever get to "A-1-1"

https://app.screencast.com/jkr3wi1t59TV2

Best Regards,
Nuno Aguiar