chore: Remove dead code due to unused arguments

- The skipResetBindings constructor parameter was removed in
  4ee29e89, so all related code can be
  removed.
- The ShortcutsEpic.openSidebarDropdown static method's only parameter
  was removed in
  https://gitlab.com/gitlab-org/gitlab/-/merge_requests/75302, so
  there's no point passing anything to it.
- The ShortcutsTestCase.openSidebarDropdown static method never expected
  any parameters since creation in
  https://gitlab.com/gitlab-org/gitlab/-/merge_requests/109527, so
  there's no point passing anything to it.

app/assets/javascripts/behaviors/shortcuts/shortcuts_blob.js

@@ -11,7 +11,6 @@ import { updateRefPortionOfTitle } from '~/repository/utils/title';
 import Shortcuts from './shortcuts';
 
 const defaults = {
-  skipResetBindings: false,
   fileBlobPermalinkUrl: null,
   fileBlobPermalinkUrlElement: null,
 };
@@ -24,7 +23,7 @@ function eventHasModifierKeys(event) {
 export default class ShortcutsBlob extends Shortcuts {
   constructor(opts) {
     const options = { ...defaults, ...opts };
-    super(options.skipResetBindings);
+    super();
     this.options = options;
 
     this.shortcircuitPermalinkButton();

app/assets/javascripts/pages/projects/init_blob.js

@@ -22,7 +22,6 @@ export default () => {
 
   // eslint-disable-next-line no-new
   new ShortcutsBlob({
-    skipResetBindings: true,
     fileBlobPermalinkUrl,
     fileBlobPermalinkUrlElement,
   });

app/assets/javascripts/repository/components/blob_controls.vue

@@ -101,7 +101,6 @@ export default {
         fileBlobPermalinkUrlElement && fileBlobPermalinkUrlElement.getAttribute('href');
       // eslint-disable-next-line no-new
       new ShortcutsBlob({
-        skipResetBindings: true,
         fileBlobPermalinkUrl,
         fileBlobPermalinkUrlElement,
       });

ee/app/assets/javascripts/behaviors/shortcuts/shortcuts_epic.js

-import $ from 'jquery';
 import Mousetrap from 'mousetrap';
 import {
   keysFor,
@@ -12,11 +11,7 @@ export default class ShortcutsEpic extends ShortcutsIssuable {
   constructor() {
     super();
 
-    const $issuableSidebar = $('.js-issuable-update');
-
-    Mousetrap.bind(keysFor(ISSUABLE_CHANGE_LABEL), () =>
-      ShortcutsEpic.openSidebarDropdown($issuableSidebar.find('.js-labels-block')),
-    );
+    Mousetrap.bind(keysFor(ISSUABLE_CHANGE_LABEL), ShortcutsEpic.openSidebarDropdown);
     Mousetrap.bind(keysFor(ISSUABLE_COMMENT_OR_REPLY), ShortcutsIssuable.replyWithSelectedText);
     Mousetrap.bind(keysFor(ISSUABLE_EDIT_DESCRIPTION), ShortcutsIssuable.editIssue);
   }

ee/app/assets/javascripts/behaviors/shortcuts/shortcuts_test_case.js

-import $ from 'jquery';
 import Mousetrap from 'mousetrap';
 import { keysFor, ISSUABLE_CHANGE_LABEL } from '~/behaviors/shortcuts/keybindings';
 import ShortcutsIssuable from '~/behaviors/shortcuts/shortcuts_issuable';
@@ -7,11 +6,7 @@ export default class ShortcutsTestCase extends ShortcutsIssuable {
   constructor() {
     super();
 
-    const $issuableSidebar = $('.issuable-sidebar');
-
-    Mousetrap.bind(keysFor(ISSUABLE_CHANGE_LABEL), () =>
-      ShortcutsTestCase.openSidebarDropdown($issuableSidebar.find('.js-labels-block')),
-    );
+    Mousetrap.bind(keysFor(ISSUABLE_CHANGE_LABEL), ShortcutsTestCase.openSidebarDropdown);
   }
 
   static openSidebarDropdown() {