Add ability to turn TCF on/off

[Kelsey-Ethyca]

This can be a beta feature flag for the frontend.
We will need to figure out how we want this to call the TCF POC api that enables/disables the feature in the backend.

[allisonking]

Is the goal for this ticket to add a toggle to this page for TCF?

I'd hesitate against adding it here as all of the features here are UI features—if one user toggles it, they only change the experience for themselves. However, TCF being enabled is a backend state, so if a user clicks the toggle, it'll make the change for everyone, which might be unexpected. We talked about this a bit when we worked on RBAC, and had punted giving a permission to feature flags since we decided it was okay for most users to see the page since it only makes the change for themselves.

At the very least, maybe it could be a toggle that is on the same page but in a different section which indicates it will affect the backend? Or we should add stricter permissions?

[allisonking]

from @Kelsey-Ethyca : we are not going to do this right now

[TheAndrewJackson]

This is now going to be done using an environment variable and the consent settings related code is going to be removed #4220

[Roger-Ethyca]

moving to done