Add UI test for PlanPolicy form view

[emmaaroche]

Details

PlanPolicy form has: policy name, target gateway, array of plans (tier, predicate, limits). Add/remove plan buttons.

Checklist

• Policy name required field validation
• Target gateway selector validation
• Add plan button creates new plan entry
• Remove plan button deletes plan entry
• Plan tier field validation
• Plan predicate field validation
• Plan limits configuration
• Form/YAML toggle preserves data
• Form submission creates resource
• Edit mode loads existing resource