feat: add saml policy

enterprise/app/policies/account_saml_settings_policy.rb

@@ -0,0 +1,17 @@
+class AccountSamlSettingsPolicy < ApplicationPolicy
+  def show?
+    @account_user.administrator?
+  end
+
+  def create?
+    @account_user.administrator?
+  end
+
+  def update?
+    @account_user.administrator?
+  end
+
+  def destroy?
+    @account_user.administrator?
+  end
+end