message: refactor: add test selectors to project-contributors/list/item
diff: <SortableItem
  + data-test-project-contributors-list-item-id={{@contributor.users.id}}
  local-class={{concat 'row ' (get @contributor 'highlightClass')}}
  @class='row'
  @model={{@contributor}}
  </div>
  {{! Profile image}}
  - <div class='col-xs-2 col-sm-1'>
  + <div
  + data-test-project-contributors-list-item-name
  + class='col-xs-2 col-sm-1'
  + >
  <img
  local-class='profile-image'
  class='m-l-xs'
  </div>
  {{! Name }}
  - <div class='col-xs-7 col-sm-3 text-nowrap'>
  + <div
  + data-test-project-contributors-list-item-name
  + class='col-xs-7 col-sm-3 text-nowrap'
  + >
  {{#if @contributor.unregisteredContributor}}
  {{@contributor.unregisteredContributor}}
  {{else}}
  <div class='visible-xs-inline-block col-xs-1'>
  <button
  + data-test-project-contributors-list-item-x-button
  {{action @removeContributor @contributor}}
  class='text-danger'
  aria-label={{t 'app_components.project_contributors.list.item.remove_author'}}
  </span>
  {{#if this.canChangePermissions}}
  <PowerSelect
  + data-test-project-contributors-list-item-permissions-select
  @searchEnabled={{false}}
  @options={{this.permissions}}
  @onchange={{action @updatePermissions @contributor}}
  {{t (concat 'app_components.project_contributors.list.item.permissions.' option)}}
  </PowerSelect>
  {{else}}
  - <span class='text-smaller'>
  + <span
  + data-test-project-contributors-list-item-permissions-display
  + class='text-smaller'
  + >
  {{t (concat 'app_components.project_contributors.list.item.permissions.' @contributor.permission)}}
  </span>
  {{/if}}
  {{! Bibliographic (Citation) }}
  <div
  + data-test-project-contributors-list-item-citation-checkbox
  local-class='text-sm-center'
  class='col-xs-10 col-xs-offset-2 col-sm-2 col-sm-offset-0 bib-padding'
  >
  {{! Remove }}
  <div class='hidden-xs col-sm-2 text-center'>
  <button
  + data-test-project-contributors-list-item-remove-button
  {{action @removeContributor @contributor}}
  class='btn btn-danger btn-sm'
  disabled={{not this.canRemove}}
  