Automatic merge from submit-queue (batch tested with PRs 38149, 38156, 38150)

Node E2E: Remove setup-node option

This PR removes `setup-node` option, because:
* It is misleading. `setup-node` doesn't really setup the node, test framework will only put current user into docker user group when it is specified.
* It is not necessary anymore. Because we always run node e2e test as root now, we don't need to do this anymore.

This is a minor cleanup preparing for my test framework refactoring work. Will send out the refactor PR later.

/cc @kubernetes/sig-node