[web] update the keyserver selection modal based on the connection status

Summary:
In the desgins for the keyserver selection modal, the text of the keyserver remove info changes based on if you are currently connected to the selected keyserver or not. This diff introduces this functionality to the keyserver selection modal

For context here are the figma designs:
connected:

disconnected:

Linear task: https://linear.app/comm/issue/ENG-5497/introduce-remove-keyserver-ui

Test Plan:
Please see the screenshots below

connected:

disconnected:

Reviewers: inka, rohan, michal

Reviewed By: rohan

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10079