Fix release branches in tests GH action (#7614)

Use 2 stars to mean any branch under release.

Author: eerhardt

.github/workflows/tests.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
     branches: 
       - main
-      - 'release/*'
+      - 'release/**'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}