Remove <abbr> permissions list on app names

This tooltip was on our list of things that don't seem like they'd
comply with the design system.

I've now spoken to a few recent and frequent users of the API Users
index page and of the ones who knew this feature existed, none have used
it, so I'm happy to remove it.

The tests that used this feature are now using the API User edit page to
get that information.

app/helpers/api_users_helper.rb

@@ -8,15 +8,13 @@ def api_user_name(user)
     user.suspended? ? content_tag(:del, anchor_tag) : anchor_tag
   end
 
-  def permissions_by_application(user)
+  def application_list(user)
     content_tag(:ul, class: "govuk-list") do
       safe_join(
         visible_applications(user).map do |application|
           next unless user.permissions_for(application).any?
 
-          content_tag(:li) do
-            content_tag(:abbr, application.name, title: "Permissions: #{user.permissions_for(application).to_sentence}")
-          end
+          content_tag(:li, application.name)
         end,
       )
     end

app/views/api_users/index.html.erb

@@ -36,7 +36,7 @@
         text: user.email,
       },
       {
-        text: permissions_by_application(user),
+        text: application_list(user),
       },
       {
         text: user.suspended? ? "Yes" : "No",

test/integration/manage_api_users_test.rb

@@ -19,7 +19,7 @@ class ManageApiUsersTest < ActionDispatch::IntegrationTest
       assert page.has_selector?("td", text: @api_user.name)
       assert page.has_selector?("td", text: @api_user.email)
 
-      assert page.has_selector?("abbr", text: @application.name)
+      assert page.has_selector?("td", text: @application.name)
       assert page.has_selector?("td:last-child", text: "No") # suspended?
     end
 
@@ -54,16 +54,26 @@ class ManageApiUsersTest < ActionDispatch::IntegrationTest
       select "Managing Editor", from: "Permissions for Whitehall"
       click_button "Update API user"
 
-      assert page.has_selector?("abbr[title='Permissions: Managing Editor and signin']", text: "Whitehall")
-
       click_link @api_user.name
 
+      within "table#editable-permissions" do
+        # The existence of the <tr> indicates that the API User has "singin"
+        # permission for Whitehall
+        assert has_selector?("tr", text: "Whitehall")
+      end
+      assert has_select?("Permissions for Whitehall", selected: ["Managing Editor"])
+
       unselect "Managing Editor", from: "Permissions for Whitehall"
       click_button "Update API user"
 
-      assert page.has_selector?("abbr[title='Permissions: signin']", text: "Whitehall")
-
       click_link @api_user.name
+
+      within "table#editable-permissions" do
+        # The existence of the <tr> indicates that the API User has "singin"
+        # permission for Whitehall
+        assert has_selector?("tr", text: "Whitehall")
+      end
+
       click_link "Account access log"
       assert page.has_text?("Access token generated for Whitehall by #{@superadmin.name}")
     end