feat: add npm workspace install step to workflow

Adds a separate "Install" step to ensure all workspace dependencies are
installed before running tests.

Issue: BTC-2786

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

.github/workflows/build-and-test.yaml

@@ -87,6 +87,9 @@ jobs:
         run: npm run test:wasm-pack-chrome
         working-directory: packages/wasm-utxo
 
+      - name: Install
+        run: npm --workspaces install
+
       - name: Unit Test
         run: npm --workspaces test