Add instrumentation to Pages deployments

app/services/projects/update_pages_service.rb

config/events/create_pages_deployment.yml

...tinct_project_id_from_create_pages_deployment_monthly.yml

...distinct_user_id_from_create_pages_deployment_monthly.yml

...stinct_project_id_from_create_pages_deployment_weekly.yml

..._distinct_user_id_from_create_pages_deployment_weekly.yml

...etrics/counts_all/count_total_create_pages_deployment.yml

ee/config/events/create_pages_extra_deployment.yml

...project_id_from_create_pages_extra_deployment_monthly.yml

...ct_user_id_from_create_pages_extra_deployment_monthly.yml

..._project_id_from_create_pages_extra_deployment_weekly.yml

...nct_user_id_from_create_pages_extra_deployment_weekly.yml

.../counts_all/count_total_create_pages_extra_deployment.yml

ee/spec/services/ee/projects/update_pages_service_spec.rb

spec/services/projects/update_pages_service_spec.rb

..._examples/controllers/internal_event_tracking_examples.rb