fix: return last plugin response

[lbendavid-cloudinary]

Pull request for cloudinary/frontend-frameworks

For which package is this PR?

@cloudinary/html

What does this PR solve?

Instead of returning the promise result inside the loop, returning the promise of the last plugin, which solve the issue when multiple plugins working together ends up in a wrong order of requests

Final checklist

• [ ] Implementation is aligned to Spec.
• [ ] Tests - Add proper tests to the added code.
• [ ] Relates to a github issue (link to issue).