Remove unused weight select

The weight select seems to be unused, so we can remove it safely. The
last usage was removed with 303e854b.

ee/app/assets/javascripts/pages/projects/issues/form.js

 import initEpicsSelect from 'ee/vue_shared/components/sidebar/epics_select/epics_select_bundle';
-import WeightSelect from 'ee/weight_select';
 import initForm from '~/pages/projects/issues/form';
 
 export default () => {
   initEpicsSelect();
-  // eslint-disable-next-line no-new
-  new WeightSelect();
   initForm();
 };

ee/app/assets/javascripts/weight_select.js

-/* eslint-disable no-shadow */
-
-import $ from 'jquery';
-import initDeprecatedJQueryDropdown from '~/deprecated_jquery_dropdown';
-
-function WeightSelect(els, options = {}) {
-  const $els = $(els || '.js-weight-select');
-
-  $els.each((i, dropdown) => {
-    const $dropdown = $(dropdown);
-    const $selectbox = $dropdown.closest('.selectbox');
-    const $block = $selectbox.closest('.block');
-    const $value = $block.find('.value');
-    $block.find('.block-loading').addClass('gl-display-none');
-    const fieldName = options.fieldName || $dropdown.data('fieldName');
-    const inputField = $dropdown.closest('.selectbox').find(`input[name='${fieldName}']`);
-
-    if (Object.keys(options).includes('selected')) {
-      inputField.val(options.selected);
-    }
-
-    return initDeprecatedJQueryDropdown($dropdown, {
-      selectable: true,
-      fieldName,
-      toggleLabel(selected, el) {
-        return $(el).data('id');
-      },
-      hidden() {
-        $selectbox.hide();
-        return $value.css('display', '');
-      },
-      id(obj, el) {
-        if ($(el).data('none') == null) {
-          return $(el).data('id');
-        }
-        return '';
-      },
-      clicked(deprecatedJQueryDropdownEvt) {
-        const { e } = deprecatedJQueryDropdownEvt;
-        let selected = deprecatedJQueryDropdownEvt.selectedObj;
-        const inputField = $dropdown.closest('.selectbox').find(`input[name='${fieldName}']`);
-
-        if (options.handleClick) {
-          e.preventDefault();
-          selected = inputField.val();
-          options.handleClick(selected);
-        } else if ($dropdown.is('.js-issuable-form-weight')) {
-          e.preventDefault();
-        }
-      },
-    });
-  });
-}
-
-export default WeightSelect;

ee/app/helpers/ee/issues_helper.rb

@@ -4,33 +4,6 @@ module EE
   module IssuesHelper
     extend ::Gitlab::Utils::Override
 
-    def weight_dropdown_tag(issuable, opts = {}, &block)
-      title = issuable.weight || 'Weight'
-      additional_toggle_class = opts.delete(:toggle_class)
-      options = {
-        toggle_class: "js-weight-select #{additional_toggle_class}",
-        dropdown_class: 'dropdown-menu-selectable dropdown-menu-weight',
-        title: 'Select weight',
-        placeholder: 'Search weight',
-        data: {
-          field_name: "#{issuable.class.model_name.param_key}[weight]",
-          default_label: 'Weight'
-        }
-      }.deep_merge(opts)
-
-      dropdown_tag(title, options: options) do
-        capture(&block)
-      end
-    end
-
-    def weight_dropdown_label(weight)
-      if Issue.weight_options.include?(weight)
-        weight
-      else
-        h(weight.presence || 'Weight')
-      end
-    end
-
     def issue_in_subepic?(issue, epic_id)
       # This helper is used if a list of issues are filtered by epic id
       return false if epic_id.blank?