Update vulnerability metric to use constant

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/352915

app/assets/javascripts/security_configuration/constants.js

 export const TRACK_TOGGLE_TRAINING_PROVIDER_ACTION = 'toggle_security_training_provider';
 export const TRACK_TOGGLE_TRAINING_PROVIDER_LABEL = 'update_security_training_provider';
-
+export const TRACK_CLICK_TRAINING_LINK = 'click_security_training_link';
 export const TRACK_PROVIDER_LEARN_MORE_CLICK_ACTION = 'click_link';
 export const TRACK_PROVIDER_LEARN_MORE_CLICK_LABEL = 'security_training_provider';

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

@@ -6,6 +6,7 @@ import securityTrainingProvidersQuery from '~/security_configuration/graphql/sec
 import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import axios from '~/lib/utils/axios_utils';
 import Tracking from '~/tracking';
+import { TRACK_CLICK_TRAINING_LINK } from '~/security_configuration/constants';
 import { SUPPORTED_IDENTIFIER_TYPES } from '../constants';
 
 export const i18n = {
@@ -116,9 +117,7 @@ export default {
       const { name } = this.supportedIdentifier;
       const { id } = mockProvider;
 
-      // Follow-up: switch to utilize constants once another MR is merged
-      // https://gitlab.com/gitlab-org/gitlab/-/issues/352915
-      this.track('click_security_training_link', {
+      this.track(TRACK_CLICK_TRAINING_LINK, {
         label: `vendor_${id}`,
         property: name,
       });

ee/spec/frontend/vulnerabilities/vulnerability_training_spec.js

@@ -14,6 +14,7 @@ import VulnerabilityTraining, {
 import securityTrainingProvidersQuery from '~/security_configuration/graphql/security_training_providers.query.graphql';
 import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
 import { SUPPORTED_IDENTIFIER_TYPES } from 'ee/vulnerabilities/constants';
+import { TRACK_CLICK_TRAINING_LINK } from '~/security_configuration/constants';
 import createMockApollo from 'helpers/mock_apollo_helper';
 import waitForPromises from 'helpers/wait_for_promises';
 import { securityTrainingProvidersResponse } from 'jest/security_configuration/mock_data';
@@ -197,9 +198,7 @@ describe('VulnerabilityTraining component', () => {
       await waitForQueryToBeLoaded();
       await findTrainingItemLink().vm.$emit('click');
 
-      // Follow-up: switch to utilize constants once another MR is merged
-      // https://gitlab.com/gitlab-org/gitlab/-/issues/352915
-      expect(trackingSpy).toHaveBeenCalledWith(undefined, 'click_security_training_link', {
+      expect(trackingSpy).toHaveBeenCalledWith(undefined, TRACK_CLICK_TRAINING_LINK, {
         property: defaultProps.identifiers[0].name,
         label: `vendor_${mockProvider.id}`,
       });