Support external tests run without docker

Current external tests are supposed to run with dockers, which lets people focus on setting up test running rather than correctly configuring machines.

There is an increasing requirement to run the tests on local or native environment without docker installed.
For example:

- running tests on mac or windows.
- running directly against pre-build jdk (no docker image available) , could use EXTRA_DOCKER_ARGS to set jdk as default java. Need to double check if it still work.

The issue names no files or tests; start by locating the external-test runner and its Docker setup. Determine how the runner can use local or native environments on macOS and Windows, including a prebuilt JDK without a Docker image. Done means the external tests run successfully without Docker.

Written by the indexing model from the issue text.