Add design widget wrapper

What does this MR do and why?

This MR is first of 2 MRs for adding design widget to work items.

• adds designs widget to work_item_definitions table via a post migration
• adds designs widget to issue work item types in BaseTypeImporter of work items
• adds designs widget wrapper around work item to respond to design related methods(will be consumed in the next MR in GraphQl).

Issue: #387552

GraphQl Query

{
  workItem(id: "gid://gitlab/WorkItem/530") {
    id,
    workItemType {
      id,
      name
    },
    widgets {
      type
      ... on WorkItemWidgetDesigns {
        		__typename,
        designCollection {
        __typename
        copyState
        designs {
          __typename
          nodes {
            __typename
            id
            event
            filename
            notesCount
            image
            imageV432x230
            currentUserTodos(state: pending) {
              __typename
              nodes {
                __typename
                id
              }
            }
          }
        }
        versions {
          __typename
          nodes {
            __typename
            id
            sha
            createdAt
            author {
              __typename
              id
              name
              avatarUrl
            }
          }
        }
      }
      }
    }
  }
}

GraphQl Response

{
  "data": {
    "workItem": {
      "id": "gid://gitlab/WorkItem/530",
      "workItemType": {
        "id": "gid://gitlab/WorkItems::Type/1",
        "name": "Issue"
      },
      "widgets": [
        {
          "type": "ASSIGNEES"
        },
        {
          "type": "LABELS"
        },
        {
          "type": "DESCRIPTION"
        },
        {
          "type": "HIERARCHY"
        },
        {
          "type": "START_AND_DUE_DATE"
        },
        {
          "type": "MILESTONE"
        },
        {
          "type": "NOTES"
        },
        {
          "type": "ITERATION"
        },
        {
          "type": "WEIGHT"
        },
        {
          "type": "HEALTH_STATUS"
        },
        {
          "type": "NOTIFICATIONS"
        },
        {
          "type": "CURRENT_USER_TODOS"
        },
        {
          "type": "AWARD_EMOJI"
        },
        {
          "type": "DESIGNS",
          "__typename": "WorkItemWidgetDesigns",
          "designCollection": {
            "__typename": "DesignCollection",
            "copyState": "READY",
            "designs": {
              "__typename": "DesignConnection",
              "nodes": []
            },
            "versions": {
              "__typename": "DesignVersionConnection",
              "nodes": []
            }
          }
        },
        {
          "type": "LINKED_ITEMS"
        },
        {
          "type": "PARTICIPANTS"
        }
      ]
    }
  }
}

Migrations

bundle exec rake db:migrate:up:main VERSION=20240130070854

main: == [advisory_lock_connection] object_id: 117480, pg_backend_pid: 21048
main: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: migrating ============
main: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: migrated (0.0298s) ===

main: == [advisory_lock_connection] object_id: 117480, pg_backend_pid: 21048

bundle exec rake db:migrate:up:ci VERSION=20240130070854

ci: == [advisory_lock_connection] object_id: 117420, pg_backend_pid: 22254
ci: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: migrating ============
ci: -- The migration is skipped since it modifies the schemas: [:gitlab_main].
ci: -- This database can only apply migrations in one of the following schemas: [:gitlab_ci, :gitlab_internal, :gitlab_shared].
ci: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: migrated (0.0083s) ===

ci: == [advisory_lock_connection] object_id: 117420, pg_backend_pid: 22254

bundle exec rake db:migrate:down:main VERSION=20240130070854

main: == [advisory_lock_connection] object_id: 117420, pg_backend_pid: 19745
main: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: reverting ============
main: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: reverted (0.0539s) ===

main: == [advisory_lock_connection] object_id: 117420, pg_backend_pid: 19745

bundle exec rake db:migrate:down:ci VERSION=20240130070854

ci: == [advisory_lock_connection] object_id: 117420, pg_backend_pid: 20314
ci: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: reverting ============
ci: -- The migration is skipped since it modifies the schemas: [:gitlab_main].
ci: -- This database can only apply migrations in one of the following schemas: [:gitlab_ci, :gitlab_internal, :gitlab_shared].
ci: == 20240130070854 AddDesignsWidgetToWorkItemDefinitions: reverted (0.0081s) ===

ci: == [advisory_lock_connection] object_id: 117420, pg_backend_pid: 20314

How to set up and validate locally

1. Run bundle exec rails db:migrate
2. Once done, visit any issue on GDK and click on the issue, one you are on the issue show page, upload few designs to the issue.
3. Now, replace /issue/ in the URL to /work_items/. You should see a work item view for the issue. Copy the Gid of it.
4. Got to graphql-explorer and enter the query mentioned above with the WotkItem GId. You should see default value for designs returned.

Related to #387552