Remove Bazel test runner binaries.

The Bazel test runner requires a lot of Linux binaries to be installed.

Bazel should be hermetic in-terms of running test binaries. This may need upstream work to determine what to do here.

Ultimately Bazel should be hermetic to run tests.

We can then remove all the binaries that Bazel test runner expects, such as pgrep, kill, sed, whoami, etc.