feat(helm): support namespaced RBAC for MCP controller (#127) Sibling of https://github.com/kagent-dev/tools/pull/53 and https://github.com/kagent-dev/kagent/pull/1549 Fixes a CI issue. Also separates out the build step in CI before running E2E tests. --------- Signed-off-by: Jet Chiang <pokyuen.jetchiang-ext@solo.io>