fixing MCP headers usag for Llama stack 0.4.x, adding additional e2e tests for mcp servers#1080

blublinsky wants to merge 2 commits intolightspeed-core:mainlightspeed-core/lightspeed-stack:mainfrom

blublinsky:mcp-e2e-testsblublinsky/lightspeed-stack:mcp-e2e-testsCopy head branch name to clipboard