feat: Abstract work item attributes to a single list/board component

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Create a new common component to render standard attributes in touchpoints with similar representing.

Component: app/assets/javascripts/vue_shared/components/work_item_attribute.vue

Respective components with different visual touchpoints:

• Due data
  • Boards: app/assets/javascripts/boards/components/issue_due_date.vue
  • List: app/assets/javascripts/issues/list/components/issue_card_time_info.vue
  • Child items: ee/app/assets/javascripts/work_items/components/shared/work_item_link_child_metadata.vue
• Weight
  • Board: ee/app/assets/javascripts/issues/components/issue_weight.vue
  • List: ee/app/assets/javascripts/issues/list/components/issue_card_time_info.vue
  • Child items: ee/app/assets/javascripts/work_items/components/shared/work_item_link_child_metadata.vue
• Milestone:
  • Board: app/assets/javascripts/issuable/components/issue_milestone.vue
  • List: vue_shared/issuable/list/components/issuable_milestone.vue
  • Child items: app/assets/javascripts/issuable/components/issue_milestone.vue
• Iteration:
  • Board: ee/app/assets/javascripts/boards/components/issue_iteration.vue

Visual comparition

Due Dates

Child items:

After	Before

List:

After	Before

Board:

After	Before

Weight

After	Before

List:

After	Before

Board:

After	Before

Milestone

Child items:

After	Before

List:

After	Before

Board:

After	Before

Iterations

Board:

After	Before

Relates to #501677 (closed)