ci: Fix publish workflow (#420)

The publishing workflow attempted to run a `yarn build` script that does
not exist.

In this repository, the `src` directory of each package is published
directly with no build step. The publish workflow was fixed by removing
the invalid build command.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Removes the nonexistent `yarn build` step from
`.github/workflows/publish-release.yml`, leaving artifact upload of
package `src` files intact.
> 
> - **CI / GitHub Actions**
>   - `/.github/workflows/publish-release.yml`:
>     - Remove `run: yarn build` step from `publish-release` job.
> - Continue uploading `./packages/**/src` and `.yarn-state.yml` as
artifacts.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
4d572ab. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: Gudahtt

.github/workflows/publish-release.yml

@@ -21,7 +21,6 @@ jobs:
       - uses: MetaMask/action-publish-release@v3
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      - run: yarn build
       - name: Upload build artifacts
         uses: actions/upload-artifact@v4
         with: