Removes knapsack non-pro

Gemfile

@@ -152,7 +152,6 @@ group :test, :development do
   gem "factory_bot_rails", '6.2.0', require: false
   gem 'fuubar', '~> 2.5.1'
   gem 'json_spec', '~> 1.1.4'
-  gem 'knapsack', require: false
   gem 'knapsack_pro'
   gem 'letter_opener', '>= 1.4.1'
   gem 'rspec-rails', ">= 3.5.2"

Gemfile.lock

@@ -375,8 +375,6 @@ GEM
     jsonapi-serializer (2.2.0)
       activesupport (>= 4.2)
     jwt (2.5.0)
-    knapsack (4.0.0)
-      rake
     knapsack_pro (3.4.1)
       rake
     launchy (2.5.0)
@@ -820,7 +818,6 @@ DEPENDENCIES
   json_spec (~> 1.1.4)
   jsonapi-serializer
   jwt (~> 2.3)
-  knapsack
   knapsack_pro
   letter_opener (>= 1.4.1)
   listen

Rakefile

@@ -8,6 +8,3 @@ require_relative 'config/application'
 
 Openfoodnetwork::Application.load_tasks
 
-if !ENV['DISABLE_KNAPSACK'] && defined?(Knapsack)
-  Knapsack.load_tasks
-end

spec/spec_helper.rb

@@ -5,14 +5,6 @@ require 'base_spec_helper'
 require 'database_cleaner'
 require 'view_component/test_helpers'
 
-# This spec_helper.rb is being used by the custom engines in engines/. The engines are not set up to
-# use Knapsack, and this provides the option to disable it when running the tests in CI services.
-unless ENV['DISABLE_KNAPSACK']
-  require 'knapsack'
-  Knapsack.tracker.config(enable_time_offset_warning: false) unless ENV['CI']
-  Knapsack::Adapters::RSpecAdapter.bind
-end
-
 Capybara.javascript_driver = :chrome
 Capybara.default_max_wait_time = 30
 Capybara.disable_animation = true