fix: use pnpm build:libs before publishing (#1494)

## Context
`@fuels/playwright-utils` was being published to npm without its dist
folder.

## This PR
- Adds `pnpm build:libs` before publishing

## Ref
- FuelLabs/fuel-explorer#569
-
https://www.npmjs.com/package/@fuels/playwright-utils/v/0.29.0?activeTab=code

Co-authored-by: Luiz Gomes <8636507+LuizAsFight@users.noreply.github.com>

.changeset/tidy-wombats-push.md

@@ -0,0 +1,5 @@
+---
+"@fuels/playwright-utils": patch
+---
+
+- Added pnpm build to the publish action, ensuring "dist" folder will be published

.github/workflows/release-npm-changeset.yaml

@@ -45,6 +45,9 @@ jobs:
           git config --global user.name "${{ github.actor }}"
           git config --global user.email "${{ github.actor }}@users.noreply.github.com"
 
+      - name: Build packages
+        run: pnpm build:libs
+
       - name: Create Release Pull Request or Publish to NPM
         id: changesets
         uses: FuelLabs/changesets-action@main