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/release.yml

@@ -40,28 +40,14 @@ jobs:
             binary: fn-windows-x64.exe
 
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
+      - name: Setup Node and install dependencies
+        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
+          install-args: ""
 
       - name: Install Bun
         uses: oven-sh/setup-bun@v2
 
-      - name: Install dependencies
-        run: pnpm install
-
       - name: Build
         run: pnpm build