Merge branch 'tr-incident-escalation-status' into 'master'

...ets/javascripts/sidebar/components/incidents/constants.js

...cripts/sidebar/components/incidents/escalation_status.vue

...idebar/components/incidents/sidebar_escalation_status.vue

app/assets/javascripts/sidebar/components/incidents/utils.js

app/assets/javascripts/sidebar/constants.js

app/assets/javascripts/sidebar/mount_sidebar.js

...vascripts/sidebar/queries/escalation_status.query.graphql

...sidebar/queries/update_escalation_status.mutation.graphql

app/controllers/projects/incidents_controller.rb

app/views/shared/issuable/_sidebar.html.haml

...ets/javascripts/sidebar/components/incidents/constants.js

...cripts/sidebar/components/incidents/escalation_status.vue

ee/app/controllers/ee/projects/incidents_controller.rb

ee/app/controllers/ee/projects/issues_controller.rb

ee/spec/features/incidents/incident_details_spec.rb

...nd/sidebar/components/incidents/escalation_status_spec.js

ee/spec/requests/projects/incidents_controller_spec.rb

ee/spec/requests/projects/issues_controller_spec.rb

locale/gitlab.pot

spec/features/incidents/incident_details_spec.rb