Move in product emails fully under ee as that is their only use

.rubocop_todo/layout/array_alignment.yml

.rubocop_todo/layout/first_array_element_indentation.yml

...todo/layout/line_end_string_concatenation_indentation.yml

.rubocop_todo/layout/line_length.yml

.rubocop_todo/lint/ambiguous_operator_precedence.yml

.rubocop_todo/rails/output_safety.yml

.rubocop_todo/rspec/before_all_role_assignment.yml

.rubocop_todo/rspec/context_wording.yml

.rubocop_todo/rspec/factory_bot/avoid_create.yml

.rubocop_todo/rspec/missing_feature_category.yml

.rubocop_todo/rspec/return_from_stub.yml

.rubocop_todo/rspec/scattered_let.yml

.rubocop_todo/style/format_string.yml

.rubocop_todo/style/if_unless_modifier.yml

.rubocop_todo/style/string_concatenation.yml

app/mailers/notify.rb

ee/app/mailers/ee/emails/in_product_marketing.rb

ee/app/mailers/emails/in_product_marketing.rb

ee/lib/gitlab/email/message/account_validation.rb

ee/spec/lib/gitlab/email/message/account_validation_spec.rb