Refactor `Wrapper#find` for `Wrapper#findComponent`

Part 4

Automatic conversion of Vue Test Util `Wrapper#find` for
`Wrapper#findComponent` when applied to a Vue component.

From the Vue Test Util page:
https://v1.test-utils.vuejs.org/api/wrapper/#find

```
Deprecation warning

Using find to search for a Component is deprecated and will be removed.
Use findComponent instead. The find method will continue to work for
finding elements using any valid selector.
```

spec/frontend/__helpers__/stub_component.js

@@ -38,7 +38,7 @@ export function stubComponent(Component, options = {}) {
     // Do not render any slots/scoped slots except default
     // This differs from VTU behavior which renders all slots
     template: '<div><slot></slot></div>',
-    // allows wrapper.find(Component) to work for stub
+    // allows wrapper.findComponent(Component) to work for stub
     $_vueTestUtils_original: Component,
     ...options,
   };

spec/frontend/vue_merge_request_widget/deployment/deployment_spec.js

@@ -137,9 +137,11 @@ describe('Deployment component', () => {
         if (actionButtons.includes(DeploymentViewButton)) {
           it('renders the View button with expected text', () => {
             if (status === SUCCESS) {
-              expect(wrapper.find(DeploymentViewButton).text()).toContain('View app');
+              expect(wrapper.findComponent(DeploymentViewButton).text()).toContain('View app');
             } else {
-              expect(wrapper.find(DeploymentViewButton).text()).toContain('View latest app');
+              expect(wrapper.findComponent(DeploymentViewButton).text()).toContain(
+                'View latest app',
+              );
             }
           });
         }