Handle different output formats of "choco upgrade" command

[fraenki]

Summary

The first commit fixes #382:

choco upgrade --noop <pkg> -r returns 3 pipe-delimited fields when no update is available (name|current|pinned) and 4 fields when one is (name|current|available|pinned). The provider's latest method always read values[2], so for up-to-date packages it returned the pinned flag ("false") as the version, causing spurious noop changes.

The second commit fixes #380:

Previously latest could return an empty string, nil, or a non-version string (e.g. the pinned flag bleeding into the version slot) when the source produced output that didn't match the documented machine-readable format. Puppet's package type then saw is != @latest, called provider.update, and ran choco again against the broken source.

Both fixes modify the same code, so in order to avoid conflicting PRs, I've added both fixes to this PR.

Additional Context

see #382 and #380

Related Issues (if any)

#382
#380

Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified. (For example puppet apply)