Form Builder Plugin demo outdated dependency blocks using demo

[quornik]

Documentation Issue

The Form Builder Plugin example has outdated dependency in package.json: "@payloadcms/plugin-cloud": "latest" and also it's eslint version is no longer maintained.

TO DO Steps:

• Remove the `@payloadcms/plugin-cloud' package entirely from package.json
• Bump eslint version to current (9.38.0)