Use assigned.name instead of variant.name

This resolves a deprecation warning emanating from within the
gitlab-experiment gem.

app/helpers/invite_members_helper.rb

@@ -73,7 +73,7 @@ module InviteMembersHelper
   def show_invite_members_for_task?(source)
     return unless current_user
 
-    invite_for_help_continuous_onboarding = source.is_a?(Project) && experiment(:invite_for_help_continuous_onboarding, namespace: source.namespace).variant.name == 'candidate'
+    invite_for_help_continuous_onboarding = source.is_a?(Project) && experiment(:invite_for_help_continuous_onboarding, namespace: source.namespace).assigned.name == 'candidate'
     params[:open_modal] == 'invite_members_for_task' || invite_for_help_continuous_onboarding
   end
 

ee/app/controllers/trials_controller.rb

@@ -87,7 +87,7 @@ class TrialsController < ApplicationController
 
   def stored_location_or_provided_path(path)
     if current_user.setup_for_company &&
-        experiment(:combined_registration, user: current_user).variant.name == 'candidate'
+        experiment(:combined_registration, user: current_user).assigned.name == 'candidate'
       stored_location_for(:user) || path
     else
       path

spec/experiments/application_experiment_spec.rb

@@ -305,7 +305,7 @@ RSpec.describe ApplicationExperiment, :experiment do
     end
 
     it "caches the variant determined by the variant resolver" do
-      expect(application_experiment.variant.name).to eq('candidate') # we should be in the experiment
+      expect(application_experiment.assigned.name).to eq('candidate') # we should be in the experiment
 
       application_experiment.run
 
@@ -320,7 +320,7 @@ RSpec.describe ApplicationExperiment, :experiment do
       # the control.
       stub_feature_flags(namespaced_stub: false) # simulate being not rolled out
 
-      expect(application_experiment.variant.name).to eq('control') # if we ask, it should be control
+      expect(application_experiment.assigned.name).to eq('control') # if we ask, it should be control
 
       application_experiment.run