chore: Enable the new Rubocop rules (#7122)

fixes: https://linear.app/chatwoot/issue/CW-1574/renable-the-disabled-rubocop-rules

spec/models/category_spec.rb

@@ -1,6 +1,6 @@
 require 'rails_helper'
 
-RSpec.describe Category, type: :model do
+RSpec.describe Category do
   context 'with validations' do
     it { is_expected.to validate_presence_of(:account_id) }
     it { is_expected.to validate_presence_of(:name) }