feat: setup invite to handle SAML enabled account [CW-5613] (#12439)

enterprise/app/builders/enterprise/agent_builder.rb

@@ -0,0 +1,13 @@
+module Enterprise::AgentBuilder
+  def perform
+    super.tap do |user|
+      convert_to_saml_provider(user) if user.persisted? && account.saml_enabled?
+    end
+  end
+
+  private
+
+  def convert_to_saml_provider(user)
+    user.update!(provider: 'saml') unless user.provider == 'saml'
+  end
+end