ci: move proxy, enterprise, mcp, caching, extras and gateway tests into tiers and fix the litellm-tests unit job - #42831

ci: move proxy, enterprise, mcp, caching, extras and gateway tests into tiers and fix the litellm-tests unit job#42831

devin-ai-integration[bot] wants to merge 9 commits into

mainBerriAI/litellm:mainfrom

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