Don't override existing toHaveLength matcher

The `toHaveLength` matcher in `custom-jquery-matchers` doesn't work as
expected for generic Array-like objects with a `length` property,
whereas Jest's version does.

The reason is that the former wraps the value with jQuery, which only
correctly wraps _some_ Array-like objects, like true arrays, `jQuery
instances, `NodeList`s and `HTMLCollection`s.

As such, Jest's version is more widely useful, and is otherwise
equivalent, so it should be used instead.

ee/spec/frontend/dependencies/components/app_spec.js

@@ -113,10 +113,10 @@ describe('DependenciesApp component', () => {
   const expectNoHeader = () => expect(findHeader().exists()).toBe(false);
 
   const expectDependenciesTables = () => {
-    const { wrappers } = findDependenciesTables();
-    expect(wrappers).toHaveLength(2);
-    expect(wrappers[0].props()).toEqual({ namespace: allNamespace });
-    expect(wrappers[1].props()).toEqual({ namespace: vulnerableNamespace });
+    const tables = findDependenciesTables();
+    expect(tables).toHaveLength(2);
+    expect(tables.at(0).props()).toEqual({ namespace: allNamespace });
+    expect(tables.at(1).props()).toEqual({ namespace: vulnerableNamespace });
   };
 
   const expectHeader = () => {

ee/spec/frontend/logs/components/log_control_buttons_spec.js

@@ -42,10 +42,11 @@ describe('LogControlButtons', () => {
     expect(findRefreshBtn().is(GlButton)).toBe(true);
   });
 
-  it('emits a `refresh` event on click on `refersh` button', () => {
+  it('emits a `refresh` event on click on `refresh` button', () => {
     initWrapper();
 
-    expect(wrapper.emitted('refresh')).toHaveLength(0);
+    // An `undefined` value means no event was emitted
+    expect(wrapper.emitted('refresh')).toBe(undefined);
 
     findRefreshBtn().vm.$emit('click');
 

spec/frontend/test_setup.js

@@ -57,6 +57,11 @@ Object.assign(global, {
 
 // custom-jquery-matchers was written for an old Jest version, we need to make it compatible
 Object.entries(jqueryMatchers).forEach(([matcherName, matcherFactory]) => {
+  // Don't override existing Jest matcher
+  if (matcherName === 'toHaveLength') {
+    return;
+  }
+
   expect.extend({
     [matcherName]: matcherFactory().compare,
   });