DEV: upgrade avatar-selector modal to glimmer component (#24192)

* DEV: upgrade avatar-selector modal

* DEV: add system test for avatar selection in account preferences

spec/system/user_page/user_preferences_account_spec.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+describe "User preferences for Account", type: :system do
+  fab!(:user) { Fabricate(:user) }
+  let(:user_account_preferences_page) { PageObjects::Pages::UserPreferencesAccount.new }
+  let(:avatar_selector_modal) { PageObjects::Modals::AvatarSelector.new }
+  before { sign_in(user) }
+
+  describe "avatar-selector modal" do
+    it "saves custom picture and system assigned pictures" do
+      user_account_preferences_page.open_avatar_selector_modal(user)
+      expect(avatar_selector_modal).to be_open
+
+      avatar_selector_modal.select_avatar_upload_option
+      file_path = File.absolute_path(file_from_fixtures("logo.jpg"))
+      attach_file(file_path) { avatar_selector_modal.click_avatar_upload_button }
+      expect(avatar_selector_modal).to have_user_avatar_image_uploaded
+      avatar_selector_modal.click_primary_button
+      expect(avatar_selector_modal).to be_closed
+      expect(user_account_preferences_page).to have_custom_uploaded_avatar_image
+
+      user_account_preferences_page.open_avatar_selector_modal(user)
+      avatar_selector_modal.select_system_assigned_option
+      avatar_selector_modal.click_primary_button
+      expect(avatar_selector_modal).to be_closed
+      expect(user_account_preferences_page).to have_system_avatar_image
+    end
+  end
+end