Raise error if linking method is not in approved linking methods

app/controllers/samples_controller.rb

@@ -343,6 +343,8 @@ def find_index_assets
  # @param template_attribute_title [String] the title of the template attribute to filter by
  # @return [Array<Sample>] the filtered list of samples
  def filter_linked_samples(samples, link, options, template_attribute)
+ raise ArgumentError, "Invalid linking method provided. '#{link.to_s}' is not allowed!" unless %i[linked_samples linking_samples].include? link
+
  template_attribute_title = template_attribute&.title
  samples.select do |s|
  s.send(link).any? do |x|