Add run-script-os package via yarn + fix windows compilation

[nickcastel50]

• This PR address fixing windows compilation, the syntax we were using for setting the USE_WEBIFC_SHIM environment variable wasn't valid Windows syntax.

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[pablo-mayrgundter]

LGTM but will handoff to @oo-bldrs

[pablo-mayrgundter]

Talked w/nick, he's confident so we'll go ahead