Move global "Sign out" out of the current account row (#4941)

* Rename logout to logoutEveryAccount

* Add logoutCurrentAccount()

* Make all "Log out" buttons refer to current account

Each of these usages is completely contextual and refers to a specific account.

* Add Sign out of all accounts to Settings

* Move single account Sign Out below as well

* Prompt on account removal

* Add Other Accounts header to reduce ambiguity

* Spacing fix

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/view/com/testing/TestCtrls.e2e.tsx

@@ -20,7 +20,7 @@ const BTN = {height: 1, width: 1, backgroundColor: 'red'}
 
 export function TestCtrls() {
   const queryClient = useQueryClient()
-  const {logout, login} = useSessionApi()
+  const {logoutEveryAccount, login} = useSessionApi()
   const {openModal} = useModalControls()
   const onboardingDispatch = useOnboardingDispatch()
   const {setShowLoggedOut} = useLoggedOutViewControls()
@@ -60,7 +60,7 @@ export function TestCtrls() {
       />
       <Pressable
         testID="e2eSignOut"
-        onPress={() => logout('Settings')}
+        onPress={() => logoutEveryAccount('Settings')}
         accessibilityRole="button"
         style={BTN}
       />