chore: branch policy changes (#2263)

change next/* protection policy check to use matrixed stage name for build stage on node 16

Author: gavinbarron

.github/policies/branch-protection.yml

@@ -25,7 +25,7 @@ configuration:
     requiredStatusChecks:
     - GitOps/AdvancedSecurity
     - license/cla
-    - 'Build pr / build (16.x) (pull_request)'
+    - build (16.x)
 
     # TODO: all commits should be signed. We need to get everyone signing their commits.
     requiresCommitSignatures: false