fix: empty premium fields resulting in edit key blocking

[ARajan1084]

fix: empty premium fields resulting in edit key blocking

Relevant issues

Fixes #14934
#14934

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix
✅ Test

Changes

• removes default [] value for both guardrails and prompts
• guards the form values payload by removing all premium fields for non premium users
• new vitest to ensure payload is properly cleaned
• new vitest to ensure existing functionality works for premium users

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