message: fix: remove extraneous ul wrapper on draft registrations list
  Also switch to nested angle bracket invocation for PaginatedList::HasMany
diff: @title={{t 'node.registrations.draft_registrations'}}
  >
  <div class='row' local-class='RegistrationsPane' data-test-draft-registrations-pane>
  - <ul class='list-group'>
  - {{#paginated-list/has-many
  + <PaginatedList::HasMany
  data-analytics-scope='Project Draft Registrations'
  - modelTaskInstance=this.model.taskInstance
  - relationshipName='draftRegistrations'
  - bindReload=(action (mut this.reloadDrafts))
  - query=this.draftsQueryParams
  + @modelTaskInstance={{this.model.taskInstance}}
  + @relationshipName='draftRegistrations'
  + @bindReload={{action (mut this.reloadDrafts)}}
  + @query={{this.draftsQueryParams}}
  as |list|
  - }}
  + >
  <list.item as |draftRegistration|>
  <DraftRegistrationCard
  @draftRegistration={{draftRegistration}}
  <p>{{t 'node.registrations.start_new'}}</p>
  <p>{{t 'node.registrations.learn_more' learnMoreLink='https://openscience.zendesk.com/hc/en-us/articles/360019930893'}}</p>
  </list.empty>
  - {{/paginated-list/has-many}}
  - </ul>
  + </PaginatedList::HasMany>
  </div>
  </tab.pane>
  {{/if}}
  