feat(FN-4862): add backstop test for node-settings sync auth/ownership bloc

Adds a test block covering authentication and ownership validation for node-settings sync routes, ensuring the API enforces proper authorization before settings or credentials are exchanged between nodes.

Fusion-Task-Id: FN-4862

.github/workflows/ci.yml

@@ -4,6 +4,10 @@ name: CI
 on:
   workflow_dispatch:
 
+# FN-4863: Opt JavaScript actions into Node 24 ahead of GitHub's forced cutover on 2026-06-02.
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
+
 jobs:
   lint:
     name: Lint

.github/workflows/pr-checks.yml

@@ -8,6 +8,10 @@ concurrency:
   group: pr-checks-${{ github.ref }}
   cancel-in-progress: true
 
+# FN-4863: Opt JavaScript actions into Node 24 ahead of GitHub's forced cutover on 2026-06-02.
+env:
+  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"
+
 jobs:
   lint:
     name: Lint