Fix server error when failing to follow back followers from /relationships (#23787)

app/models/form/account_batch.rb

@@ -35,9 +35,15 @@ class Form::AccountBatch
   private
 
   def follow!
+    error = nil
+
     accounts.each do |target_account|
       FollowService.new.call(current_account, target_account)
+    rescue Mastodon::NotPermittedError, ActiveRecord::RecordNotFound => e
+      error ||= e
     end
+
+    raise error if error.present?
   end
 
   def unfollow!