Issue #2914946 by drpal, dawehner, droplet: JS codestyle: no-var

core/.eslintrc.passing.json

core/misc/autocomplete.es6.js

core/misc/tabledrag.es6.js

core/misc/tabledrag.js

core/misc/tableselect.es6.js

core/misc/tableselect.js

core/modules/big_pipe/js/big_pipe.es6.js

core/modules/ckeditor/js/ckeditor.admin.es6.js

core/modules/editor/js/editor.es6.js

core/modules/editor/js/editor.formattedTextEditor.es6.js

core/modules/editor/js/editor.formattedTextEditor.js

core/modules/image/js/editors/image.es6.js

core/modules/image/js/editors/image.js

core/modules/quickedit/js/editors/formEditor.es6.js

core/modules/quickedit/js/models/EntityModel.es6.js

core/modules/quickedit/js/models/EntityModel.js

core/modules/quickedit/js/util.es6.js

core/modules/quickedit/js/views/EditorView.es6.js

core/modules/quickedit/js/views/EditorView.js

core/modules/quickedit/js/views/EntityToolbarView.es6.js