Adds new unchecked free indicator variant method

- This fixes an issue with assigning this variant.

app/experiments/new_project_sast_enabled_experiment.rb

@@ -15,4 +15,7 @@ class NewProjectSastEnabledExperiment < ApplicationExperiment # rubocop:disable
 
   def unchecked_candidate_behavior
   end
+
+  def unchecked_free_indicator_behavior
+  end
 end

spec/experiments/new_project_sast_enabled_experiment_spec.rb

@@ -4,7 +4,12 @@ require 'spec_helper'
 
 RSpec.describe NewProjectSastEnabledExperiment do
   it "defines the expected behaviors and variants" do
-    expect(subject.behaviors.keys).to match_array(%w[control candidate free_indicator unchecked_candidate])
+    expect(subject.variant_names).to match_array([
+      :candidate,
+      :free_indicator,
+      :unchecked_candidate,
+      :unchecked_free_indicator
+    ])
   end
 
   it "publishes to the database" do