build: update required pull request statuses to include specific CI checks

Add new `requiredChecks` to the pull-request config.

Author: alan-agius4

.ng-dev/pull-request.mjs

@@ -9,7 +9,7 @@ export const pullRequest = {
     default: 'auto',
     labels: [{pattern: 'merge: squash commits', method: 'squash'}],
   },
-  requiredStatuses: [{name: 'test', type: 'check'}],
+  requiredStatuses: [],
 
   // Disable target labeling in the dev-infra repo as we don't have
   // any release trains and version branches.