build: update notify slack script to ESM as it imports from ng-dev

Author: devversion

.circleci/config.yml

@@ -128,7 +128,7 @@ var_20: &slack_notify_on_failure
   run:
     name: 'Notifying team about job failure'
     when: on_fail
-    command: node ./scripts/circleci/notify-slack-job-failure.js
+    command: node ./scripts/circleci/notify-slack-job-failure.mjs
 
 # Branch filter that only matches the main branch.
 var_21: &only_main_branch_filter
@@ -509,7 +509,7 @@ jobs:
           name: Running size integration tests (failures are reported in Slack only).
           command: |
             # If the size integration tests fail, report the failure to a dedicated #components-ci-size-tracking Slack channel.
-            yarn integration-tests:size-test || node ./scripts/circleci/notify-slack-job-failure.js components-ci-size-tracking
+            yarn integration-tests:size-test || node ./scripts/circleci/notify-slack-job-failure.mjs components-ci-size-tracking
       - *slack_notify_on_failure
 
   # ----------------------------------------------------------------------------

scripts/circleci/notify-slack-job-failure.js renamed to scripts/circleci/notify-slack-job-failure.mjs

@@ -5,11 +5,11 @@
  * will be a noop when running for forked builds (i.e. PRs).
  */
 
-const {
+import {
   isVersionBranch,
   getConfig,
   assertValidGithubConfig,
-} = require('@angular/dev-infra-private/ng-dev');
+} from '@angular/dev-infra-private/ng-dev';
 
 if (process.env.CIRCLE_PR_NUMBER) {
   console.info('Skipping notifications for pull requests.');
@@ -23,7 +23,7 @@ const {
   SLACK_COMPONENTS_CI_FAILURES_WEBHOOK_URL: webhookUrl,
 } = process.env;
 
-const {github} = getConfig([assertValidGithubConfig]);
+const {github} = await getConfig([assertValidGithubConfig]);
 const isPublishBranch = isVersionBranch(branchName) || branchName === github.mainBranchName;
 
 // We don't want to spam the CI failures channel with e.g. Renovate branch failures.