feat(ci): Replace manual Aptos local testnet setup with GitHub Action

- Replaced the manual installation and execution of the Aptos local testnet with the `aptos-labs/actions/run-local-testnet` GitHub Action.
- Simplified the CI workflow by removing manual dependency installations for Aptos and related services.

This change streamlines the workflow, reduces maintenance overhead, and ensures consistency in the test environment setup.

.github/workflows/tests.yml

@@ -15,25 +15,10 @@ jobs:
       - name: Update brew
         run: brew update
 
-      - name: Install dependencies
-        run: |
-          brew install aptos
-          brew install curl
-
-      - name: Start Aptos Local Testnet
-        run: |
-          aptos node run-local-testnet & echo $! > aptos_pid.txt
-          sleep 30  # Initial wait for services to start
-          # Poll the readiness endpoint until it's available
-          until curl -sSf http://127.0.0.1:8080/; do
-            echo "Waiting for Aptos Node API to be ready..."
-            sleep 5
-          done
-          until curl -sSf http://127.0.0.1:8081/; do
-            echo "Waiting for Faucet to be ready..."
-            sleep 5
-          done
-        shell: bash
+      - name: Run a local testnet in the background
+        uses: aptos-labs/actions/run-local-testnet@main
+        with:
+          PNPM_VERSION: 8.9.0
 
       - name: Make gradlew executable
         run: chmod +x ./gradlew
@@ -43,7 +28,4 @@ jobs:
         shell: bash
 
       - name: Run tests
-        run: ./gradlew test
-
-      - name: Stop Aptos Local Testnet
-        run: kill $(cat aptos_pid.txt)
+        run: ./gradlew test