[lib][web][native] Make possible to log out of one keyserver / delete account on one keyserver

Summary:
issue: ENG-5766
We want to be able to log out / delete account on a subset of keyservers
I'm also moving fetching preRequestUserState into useDeleteKeyserverAccount, to make the code clearer.

Test Plan: Tested that it is still possible to delete account and logout on both platforms

Reviewers: michal, kamil, ginsu

Reviewed By: michal

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10603