Added ability to change user permissions in group to owner

Closes #28233

app/views/shared/members/_member.html.haml

@@ -61,7 +61,7 @@
                 = dropdown_title("Change permissions")
                 .dropdown-content
                   %ul
-                    - Gitlab::Access.options.each do |role, role_id|
+                    - member.class.access_level_roles.each do |role, role_id|
                       %li
                         = link_to role, "javascript:void(0)",
                           class: ("is-active" if member.access_level == role_id),

changelogs/unreleased/group-memebrs-owner-level.yml

@@ -0,0 +1,4 @@
+---
+title: Added option to update to owner for group members
+merge_request:
+author:

spec/features/groups/members/list_spec.rb

@@ -30,6 +30,21 @@ feature 'Groups members list', feature: true do
     expect(second_row).to be_blank
   end
 
+  it 'updates user to owner level', :js do
+    group.add_owner(user1)
+    group.add_developer(user2)
+
+    visit group_group_members_path(group)
+
+    page.within(second_row) do
+      click_button('Developer')
+
+      click_link('Owner')
+
+      expect(page).to have_button('Owner')
+    end
+  end
+
   def first_row
     page.all('ul.content-list > li')[0]
   end