* Log dependencies at verbosity level 4.
This makes it easier to debug target dependency issues.
* Scan symlinks for target dependencies.
Some test targets use symlinks to files in other test targets.
These dependencies were previously undetected. This could result in
changes made to dependencies without triggering the dependent tests.
* Track missing target deps with `needs/target/*`.
Some existing test targets have untracked dependencies on other
test targets. This can result in changes to those dependencies
not triggering their dependent tests, resulting in test failures
after a PR is merged.
This PR adds the appropriate `needs/target/*` aliases to track
those dependencies, along with appropriate processing in
ansible-test to handle the new aliases.
* Scan meta dependencies in script targets.
Script targets are often former role targets which were converted
to allow custom invocations of ansible-playbook. These targets still
have their meta dependencies, but they were not being detected.
This could result in changes to dependencies not triggering the
targets which depend on them.
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