Show UI warning to user when they need provider data but have not setup Synth yet (#1926)

* Simplify provider concerns

* Update tests

* Add UI warning for missing Synth key if family requires external data

app/models/security/provided.rb

@@ -0,0 +1,26 @@
+module Security::Provided
+  extend ActiveSupport::Concern
+
+  include Synthable
+
+  class_methods do
+    def provider
+      synth_client
+    end
+
+    def search_provider(query)
+      response = provider.search_securities(
+        query: query[:search],
+        dataset: "limited",
+        country_code: query[:country],
+        exchange_operating_mic: query[:exchange_operating_mic]
+      )
+
+      if response.success?
+        response.securities.map { |attrs| new(**attrs) }
+      else
+        []
+      end
+    end
+  end
+end