OK, I was able to find it. Was searching for googleanalytics rather than google_analytics.
I changed this reference
{{ template "_internal/google_analytics.html" . }}
to this:
{{ if not .Site.BuildDrafts }}
{{ template "_internal/google_analytics.html" . }}
{{ end }}
Given that I have no need to customize the actual google analytics code call itself - does this seem like an effective way to prevent google anayltics from being triggered during site previews with hugo internal webserver on my local machine?