add individual make task for running advisory checks

**Issue**

Advisory checks added in https://github.com/bottlerocket-os/twoliter/pull/604 only run in full kit builds.

**What I'd Like**

Targeted task / make target for running just advisory checks.

**Alternatives Considered**

Keep the status quo.

Read pull request 604 to understand how the advisory checks are currently invoked during full kit builds. Trace that invocation to the relevant build or Make entry point, then define a targeted task that runs only those checks and verify it independently from a full kit build.

Written by the indexing model from the issue text.