Try to dedupe helix content scripts with eng/scripts

[HaoK]

Ideally we can copy scripts from eng/scripts that are identical

[dougbu]

👀

[dougbu]

From #23116 (comment):

There really isn't much overlap, installnode.ps1 is the only other one really, although install chrome likely will be the next candidate once selenium tests light up

We're reused this issue a couple of times now. Should we track further de-duping in a new issue❔ Or, are you saying further work to minimize the somewhat-duplicated scripts isn't worthwhile❔

[HaoK]

Yeah its not worth it right now, there's only one file which is slightly different