FEATURE: Allow admins to delete user SSO records in the UI (#10669)

Also displays the user's last payload in the admin UI to help with debugging SSO issues.

spec/requests/admin/users_controller_spec.rb

@@ -1049,4 +1049,17 @@ RSpec.describe Admin::UsersController do
     end
   end
 
+  describe '#sso_record' do
+    fab!(:sso_record) { SingleSignOnRecord.create!(user_id: user.id, external_id: '12345', external_email: user.email, last_payload: '') }
+
+    it "deletes the record" do
+      SiteSetting.sso_url = "https://www.example.com/sso"
+      SiteSetting.enable_sso = true
+
+      delete "/admin/users/#{user.id}/sso_record.json"
+      expect(response.status).to eq(200)
+      expect(user.single_sign_on_record).to eq(nil)
+    end
+  end
+
 end