broken aria references

[whitep4nth3r]

I found two broken aria references:

Found using Wave Evaluation Tool if you want to recreate.

[whitep4nth3r]

pm-panel-npm could be related to #1425

[knowler]

For the first at some point the UI was converted from tabs to be a listbox without removing the tabpanel semantics. 🥲 For now we can remove the tab panel, but I do know that the listbox isn’t accessible (operable for at least screen readers) and I’d consider using a styleable <select> for it if we really want the listbox semantics.

For the second, I’m not sure there’s a good reason to make the section a region landmark, so I think we can remove the aria-labelledby. I left this when I was removing all of them prior, because it didn’t have a heading. I think having a heading for vulnerabilities could be valuable. I have some further thoughts on using role=alert here, but maybe I’ll bring those up in a separate issue (long story short: it’s not really being used in a proper way).