pyproject pins mcp>=2.2.0,<3, where FastMCP was renamed to MCPServer and
stateless_http, json_response, transport_security, host and port moved off
the constructor onto streamable_http_app() and run(). The two helpers still
imported mcp.server.fastmcp, so every module reaching them died at collection
and integration-extensions went red on the release candidate.
This ports the helpers verbatim from main, where the same migration already
landed in 479360ae87 after rc/1.103.0 was cut. Only the two helper files are
taken; the rest of that commit restores unrelated test surface.
Collection on the four affected modules: 4 errors and 0 tests before, 0
errors and 6 tests after.
9f79a59a41