Remove unused learn gitlab code

ee/app/controllers/concerns/registrations/create_group.rb

@@ -22,14 +22,5 @@ module Registrations::CreateGroup
     def group_params
       params.require(:group).permit(:name, :path, :visibility_level)
     end
-
-    def learn_gitlab_context
-      strong_memoize(:learn_gitlab_context) do
-        in_experiment_group_a = Gitlab::Experimentation.in_experiment_group?(:learn_gitlab_a, subject: current_user)
-        in_experiment_group_b = !in_experiment_group_a && Gitlab::Experimentation.in_experiment_group?(:learn_gitlab_b, subject: current_user)
-
-        { in_experiment_group_a: in_experiment_group_a, in_experiment_group_b: in_experiment_group_b }
-      end
-    end
   end
 end

ee/app/controllers/concerns/registrations/create_project.rb

@@ -10,11 +10,6 @@ module Registrations::CreateProject
   included do
     private
 
-    def learn_gitlab_experiment_enabled?
-      Gitlab::Experimentation.in_experiment_group?(:learn_gitlab_a, subject: current_user) ||
-        Gitlab::Experimentation.in_experiment_group?(:learn_gitlab_b, subject: current_user)
-    end
-
     def learn_gitlab_template_path
       file = if helpers.in_trial_onboarding_flow?
                LEARN_GITLAB_ULTIMATE_TEMPLATE

ee/spec/support/shared_examples/controllers/registrations/groups_controller_shared_examples.rb

@@ -25,12 +25,6 @@ RSpec.shared_examples "Registrations::GroupsController GET #new" do
 
   let_it_be(:user) { create(:user) }
   let(:dev_env_or_com) { true }
-  let(:learn_gitlab_context) do
-    {
-      in_experiment_group_a: false,
-      in_experiment_group_b: false
-    }
-  end
 
   subject { get :new }