Show Related MR's in dev widget with deduplication

app/assets/javascripts/graphql_shared/constants.js

...omponents/work_item_development/work_item_development.vue

...m_development/work_item_development_relationship_list.vue

...scripts/work_items/graphql/merge_request.fragment.graphql

...work_items/graphql/work_item_development.fragment.graphql

...ts/work_items/graphql/work_item_development.query.graphql

..._items/graphql/work_item_development.subscription.graphql

...pts/work_items/graphql/work_item_widgets.fragment.graphql

...work_items/graphql/work_item_development.fragment.graphql

...pts/work_items/graphql/work_item_widgets.fragment.graphql

...nents/work_item_development/work_item_development_spec.js

spec/features/work_items/work_item_detail_spec.rb

...velopment/work_item_development_relationship_list_spec.js

...nents/work_item_development/work_item_development_spec.js

spec/frontend/work_items/mock_data.js

...xamples/features/work_items/work_items_shared_examples.rb