Migrate ee/ci_variable_list to Jest

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/194273

ee/spec/javascripts/ci_variable_list/ci_variable_list_ee_spec.js → ee/spec/frontend/ci_variable_list/ci_variable_list_ee_spec.js

 import $ from 'jquery';
-import getSetTimeoutPromise from 'spec/helpers/set_timeout_promise_helper';
 import VariableList from '~/ci_variable_list/ci_variable_list';
 
 describe('VariableList (EE features)', () => {
@@ -37,54 +36,49 @@ describe('VariableList (EE features)', () => {
         $row.find('.js-variable-environment-dropdown-wrapper .js-dropdown-create-new-item').click();
       }
 
-      it('should add another row when editing the last rows environment dropdown', done => {
+      it('should add another row when editing the last rows environment dropdown', () => {
         addRowByNewEnvironment('someenv');
 
-        getSetTimeoutPromise()
-          .then(() => {
-            expect($wrapper.find('.js-row').length).toBe(2);
+        jest.runOnlyPendingTimers();
 
-            // Check for the correct default in the new row
-            const $environmentInput = $wrapper
-              .find('.js-row:last-child')
-              .find('input[name="variables[variables_attributes][][environment_scope]"]');
+        expect($wrapper.find('.js-row')).toHaveLength(2);
 
-            expect($environmentInput.val()).toBe('*');
-          })
-          .then(done)
-          .catch(done.fail);
+        // Check for the correct default in the new row
+        const $environmentInput = $wrapper
+          .find('.js-row:last-child')
+          .find('input[name="variables[variables_attributes][][environment_scope]"]');
+
+        expect($environmentInput.val()).toBe('*');
       });
 
-      it('should update dropdown with new environment values and remove values when row is removed', done => {
+      it('should update dropdown with new environment values and remove values when row is removed', () => {
         addRowByNewEnvironment('someenv');
 
         const $row = $wrapper.find('.js-row:last-child');
         $row.find('.js-variable-environment-toggle').click();
 
-        getSetTimeoutPromise()
-          .then(() => {
-            const $dropdownItemsBeforeRemove = $row.find(
-              '.js-variable-environment-dropdown-wrapper .dropdown-content a',
-            );
-
-            expect($dropdownItemsBeforeRemove.length).toBe(2);
-            expect($dropdownItemsBeforeRemove[0].textContent.trim()).toBe('someenv');
-            expect($dropdownItemsBeforeRemove[1].textContent.trim()).toBe('* (All environments)');
-
-            $wrapper.find('.js-row-remove-button').trigger('click');
-
-            expect($wrapper.find('.js-row').length).toBe(0);
-          })
-          .then(() => {
-            const $dropdownItemsAfterRemove = $row.find(
-              '.js-variable-environment-dropdown-wrapper .dropdown-content a',
-            );
-
-            expect($dropdownItemsAfterRemove.length).toBe(1);
-            expect($dropdownItemsAfterRemove[0].textContent.trim()).toBe('* (All environments)');
-          })
-          .then(done)
-          .catch(done.fail);
+        jest.runOnlyPendingTimers();
+
+        const $dropdownItemsBeforeRemove = $row.find(
+          '.js-variable-environment-dropdown-wrapper .dropdown-content a',
+        );
+
+        expect($dropdownItemsBeforeRemove).toHaveLength(2);
+        expect($dropdownItemsBeforeRemove[0].textContent.trim()).toBe('someenv');
+        expect($dropdownItemsBeforeRemove[1].textContent.trim()).toBe('* (All environments)');
+
+        $wrapper.find('.js-row-remove-button').trigger('click');
+
+        expect($wrapper.find('.js-row')).toHaveLength(0);
+
+        jest.runOnlyPendingTimers();
+
+        const $dropdownItemsAfterRemove = $row.find(
+          '.js-variable-environment-dropdown-wrapper .dropdown-content a',
+        );
+
+        expect($dropdownItemsAfterRemove).toHaveLength(1);
+        expect($dropdownItemsAfterRemove[0].textContent.trim()).toBe('* (All environments)');
       });
     });
   });