introduces ensure-<dep> pattern for key host level deps

[jaxesn]

Issue #, if available:

Description of changes:

There are a few utils we expect to be on the host. I have seen some of these trip people up in the past. This adds a pattern for adding prereqs to targets in the form ensure-<dep> to help guide people when they are missing deps.

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@jaxesn: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
imagebuilder-1-26-presubmit	e2f0380	link	true	/test imagebuilder-1-26-presubmit
imagebuilder-1-23-presubmit	e2f0380	link	true	/test imagebuilder-1-23-presubmit
imagebuilder-1-27-presubmit	e2f0380	link	true	/test imagebuilder-1-27-presubmit
imagebuilder-1-28-presubmit	e2f0380	link	true	/test imagebuilder-1-28-presubmit
imagebuilder-1-25-presubmit	e2f0380	link	true	/test imagebuilder-1-25-presubmit
imagebuilder-1-24-presubmit	e2f0380	link	true	/test imagebuilder-1-24-presubmit
kind-1-27-tooling-presubmit	e2f0380	link	true	/test kind-1-27-tooling-presubmit
kind-1-25-tooling-presubmit	e2f0380	link	true	/test kind-1-25-tooling-presubmit
kind-1-26-tooling-presubmit	e2f0380	link	true	/test kind-1-26-tooling-presubmit
kind-1-24-tooling-presubmit	e2f0380	link	true	/test kind-1-24-tooling-presubmit
kind-1-28-tooling-presubmit	e2f0380	link	true	/test kind-1-28-tooling-presubmit
kind-1-23-tooling-presubmit	e2f0380	link	true	/test kind-1-23-tooling-presubmit

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