Fixes bugs in yarn npm audit

[arcanis]

What's the problem this PR addresses?

The rewrite of yarn npm audit broke a couple of things in the advisory reporting.

Fixes #5824 - The --exclude filter wasn't applied to deprecations
Fixes #5830 - The --json output was printing the raw registry output, not the filtered tree

How did you fix it?

Fixed the deprecation iterations (we were iterating the unfiltered data).

Fixed the json reporting to instead print the same tree as the one we would have displayed outside of --json. It's technically a breaking change, but it was supposed to be like that so it's probably fine to treat it as a 7.0.1 bugfix.

Added tests to prevent regressions.

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.