feat: Add linter to check for potentially hanging tests

[antitree]

During the QEMU migration, we noticed that packages that have a pattern like so:

hostpathplugin --v=5 --endpoint="unix:///csi/csi.sock" --nodeid="node-000000" & sleep 5

Create a potential for an infinite hang during tests. This linter provides a WARNING if that is detected to give users a hint in the case this happens to fail a build.

[antitree]

Factored in your changes @egibs and did some reviews for false positives. Based on the wolfi-dev/os from 30 days ago, it catches many of the issues.

[stevebeattie]

This is good stuff, but I'm not sure how much the wolfictl linter is actively developed and is preferred; it seems more work on package source linting is done in melange's pkg/linter/ itself.

[justinvreeland]

package source linting is done in melange's pkg/linter/ itself.

I don't think melange linter does any package source (yaml file) linting (though it probably should). At least looking a the melange I have installed now it only lists things that would impact built packages.

[egibs]

LGTM for a first pass; we can always iterate and refine this as we fix/find more edge cases.

It would be nice to get approval from the OS team as well.