Add required status check workflow

.github/workflows/required_status_check.yml

@@ -0,0 +1,18 @@
+# workaround to simplify terraform management of required status checks,
+# see https://github.com/orgs/community/discussions/12377
+name: "Required status check"
+on:
+  pull_request:
+
+jobs:
+  complete:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - uses: int128/wait-for-workflows-action@v1
+        with:
+          filter-workflow-names: |
+            Dependency sanity checker*
+            Linters*
+            Rust*
+            Soroban RPC*