feat(FN-4100): refactor ci workflows to use reusable setup-node-pnpm compos

Refactors GitHub Actions workflow setup into a reusable composite action, consolidating repeated setup logic across CI, mobile, release, test-release, and version workflows (176 lines removed). Adds corresponding tests for the workflow configuration.

Fusion-Task-Id: FN-4100

.github/workflows/version.yml

@@ -20,22 +20,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
+      - name: Setup Node and pnpm
+        uses: ./.github/actions/setup-node-pnpm
         with:
-          node-version: "24"
-
-      - name: Install pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          node-version: "24"
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v5
-        with:
-          node-version: "24"
-          cache: pnpm
           registry-url: "https://registry.npmjs.org"
+          skip-install: "true"
 
       - name: Ensure modern npm (OIDC support)
         run: npm install -g npm@11.6.4