Make platform specific node packages pass provenance

[kevaundray]

No description provided.

[kevaundray]

In the code, we disable provenance and set it to be true before publishing the main package:

          if [ "$SHOULD_PUBLISH" = true ]; then
            # Prepare and publish the platform specific packages
            yarn prepareAndPublishAddons
            # Publish the base package, setting provenance
            # to true as it's recommended. The platform specific packages
            # don't need to have it, but we could edit them to pass provenance.
            npm config set provenance true
            npm publish --access public
          fi