Remove onboarding experience survey and email from onboarding

.rubocop_todo/gitlab/namespaced_class.yml

.rubocop_todo/layout/line_length.yml

.rubocop_todo/layout/space_inside_block_braces.yml

.rubocop_todo/layout/space_inside_parens.yml

.rubocop_todo/style/percent_literal_delimiters.yml

app/models/users/in_product_marketing_email.rb

...ervices/namespaces/in_product_marketing_emails_service.rb

...18081225_in_product_marketing_email_experience_0_sent.yml

config/routes.rb

ee/app/controllers/survey_responses_controller.rb

ee/app/views/survey_responses/index.html.haml

ee/config/feature_flags/development/calendly_invite_link.yml

ee/spec/requests/survey_responses_controller_spec.rb

ee/spec/views/survey_responses/index.html.haml_spec.rb

lib/gitlab/email/message/in_product_marketing/experience.rb

locale/gitlab.pot

...fixtures/product_intelligence/survey_response_schema.json

...ib/gitlab/email/message/in_product_marketing/base_spec.rb

...lab/email/message/in_product_marketing/experience_spec.rb

spec/lib/gitlab/email/message/in_product_marketing_spec.rb