Use bazel for PR tests (#216)
* Use bazel for running pre-merge CI tests
* Don't use HEREDOC
* Fix block text
* Use bash array
* Add bazel install
* Put Bazel in the build image
* Use Bazelisk
* Remove bazel install in Docker
* Go back to upstream XLA
* Remove bazel test command from workflow
* Move test command to build container
* Fix string format typos
