build: fix and re-enable bazel unit tests for the cdk

[jelbourn]

These were broken by rxjs 6.0, but the problem has since been fixed upstream

Overlay and tree still don't work for different reasons.

[ngbot]

I see that you just added the pr: merge ready label, but the following checks are still failing:
     status "ci/circleci: build" is failing
     status "continuous-integration/travis-ci/pr" is pending
     status "branch manager" is pending

If you want your PR to be merged, it has to pass all the CI checks.

If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

[mmalerba]

actually, looks like the bazel build is broken

[jelbourn]

Had to also update the docker container for circleci

[ngbot]

I see that you just added the pr: merge ready label, but the following checks are still failing:
     status "continuous-integration/travis-ci/pr" is failing

If you want your PR to be merged, it has to pass all the CI checks.

If you can't get the PR to a green state due to flakes or broken master, please try rebasing to master and/or restarting the CI job. If that fails and you believe that the issue is not due to your change, please contact the caretaker and ask for help.

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