Code review feedback on selectors

* Update legacy unit test selectors

ee/app/assets/javascripts/vue_shared/license_compliance/mr_widget_license_report.vue

@@ -169,7 +169,7 @@ export default {
           <gl-link
             v-if="reportContainsBlacklistedLicense && licenseComplianceDocsPath"
             :href="licenseComplianceDocsPath"
-            class="js-security-approval-help-link"
+            data-testid="security-approval-help-link"
             target="_blank"
           >
             <gl-icon :size="12" name="question" />

ee/spec/frontend/vue_shared/license_compliance/mr_widget_license_report_spec.js

@@ -338,7 +338,8 @@ describe('License Report MR Widget', () => {
   });
 
   describe('approval status', () => {
-    const findLicenseComplianceHelpLink = () => wrapper.find('.js-security-approval-help-link');
+    const findLicenseComplianceHelpLink = () =>
+      wrapper.find('[data-testid="security-approval-help-link"]');
 
     it('does not show a link to security approval help page if report does not contain blacklisted licenses', () => {
       mountComponent();