Merge branch '38096-create-resource-weight-events-table-pd' into 'master'

app/models/resource_weight_event.rb

...s/resource_events/base_synthetic_notes_builder_service.rb

app/services/resource_events/merge_into_notes_service.rb

.../resource_events/synthetic_label_notes_builder_service.rb

db/migrate/20191210211253_create_resource_weight_event.rb

db/schema.rb

ee/app/models/concerns/ee/weight_eventable.rb

ee/app/models/ee/issue.rb

ee/app/models/weight_note.rb

ee/app/services/ee/issuable/common_system_notes_service.rb

ee/app/services/ee/resource_events/change_weight_service.rb

...p/services/ee/resource_events/merge_into_notes_service.rb

...resource_events/synthetic_weight_notes_builder_service.rb

...released/38096-create-resource-weight-events-table-pd.yml

ee/spec/models/issue_spec.rb

ee/spec/requests/api/issues_spec.rb

.../services/ee/issuable/common_system_notes_service_spec.rb

...services/ee/resource_events/change_weight_service_spec.rb

...vices/ee/resource_events/merge_into_notes_service_spec.rb

...rce_events/synthetic_weight_notes_builder_service_spec.rb