Fix validation indicator to only show for presence validations

The required field indicator (*) was shown for any validation (format, length, etc.). Now it correctly only appears when a presence validation is defined, matching the standard UX expectation that * means "required".

(cherry picked from commit c948db7)

Author: Marc Antwertinger

app/components/alchemy/ingredients/base_editor.rb

@@ -178,7 +178,7 @@ def ingredient_role
           content = "#{icon} #{content}".html_safe
         end
 
-        if ingredient.has_validations?
+        if presence_validation?
           "#{content}<span class='validation_indicator'>*</span>".html_safe
         else
           content

spec/components/alchemy/ingredients/base_editor_spec.rb

@@ -186,7 +186,7 @@
       end
 
       it "does not show any validation indicator" do
-        is_expected.to have_selector(".validation_indicator")
+        is_expected.to_not have_selector(".validation_indicator")
       end
     end
   end