Add loading spinner to submit button

ee/app/assets/javascripts/vulnerabilities/components/new_vulnerability/new_vulnerability.vue

@@ -225,7 +225,7 @@ export default {
           type="submit"
           variant="confirm"
           class="js-no-auto-disable gl-mr-3"
-          :disabled="submitting"
+          :loading="submitting"
           >{{ $options.i18n.submitVulnerability }}</gl-button
         >
         <gl-button

ee/spec/frontend/vulnerabilities/new_vulnerability/new_vulnerability_spec.js

@@ -123,6 +123,8 @@ describe('New vulnerability component', () => {
       findSectionDetails().vm.$emit('change', inputs.sectionDetails);
       findSectionSolution().vm.$emit('change', inputs.sectionSolution);
       findForm().vm.$emit('submit', { preventDefault: jest.fn() });
+      await nextTick();
+      expect(findSubmitButton().props('loading')).toBe(true);
       await waitForPromises();
     };