[Feature] Add API_REFERENCE_BASE_URL and API_REFERENCE_MODEL for control plane setups#15739

Copilot wants to merge 4 commits intomainBerriAI/litellm:mainfrom

copilot/add-data-plane-url-to-api-refBerriAI/litellm:copilot/add-data-plane-url-to-api-refCopy head branch name to clipboard