Remove user_management feature flag

[eleftherias]

Remove the user_management feature flag, either by releasing the feature or deleting it.

[Mujib-Ahasan]

Hey, can I work on this?? could you please give some direction??

[evankanderson]

I think the feature should be completely released, so this would be cleaning the up the usage of the flags to make the code always take the positive (flag enabled) path (and clear out any related dead code).

[Mujib-Ahasan]

So, I have to delete the flag and the corresponding functionalities of it without breaking the code, right @evankanderson??? also is there any documentation of using this flag??

[evankanderson]

The flag defaults to false currently, but all known usage sets the flag to true.

This means finding the if flag {....} code, and removing the if and keeping the ....