**PLEASE NOTE THAT THIS DIFF AND SUBSEQUENT DIFFS IN THIS STACK WILL NOT BE LANDED UNTIL MORE OF THE REDESIGN IS READY SINCE THIS WILL CAUSE REGRESSIONS IN PROD**
This diff introduces the keyserver selection list panel and makes various UI changes to the `KeyserverSelectionList` so that it can be housed within the keyserver selection list panel
For context here is what the figma designs look like:
{F1091706}
Linear task: https://linear.app/comm/issue/ENG-5961/new-keyserver-selection-ui