[CI] Investigate "jquery-none.js" being loaded

[chancancode]

Seeing these on latest master test runs:

[0927/165420.492810:INFO:CONSOLE(17)] "A parser-blocking, cross site (i.e. different eTLD+1) script, https://code.jquery.com/jquery-none.js, is invoked via document.write. The network request for this script MAY be blocked by the browser in this or a future page load due to poor network connectivity. If blocked in this page load, it will be confirmed in a subsequent console message. See https://www.chromestatus.com/feature/5718547946799104 for more details.", source: http://localhost:13141/tests/?package=@ember/application&jquery=none (17)

https://code.jquery.com/jquery-none.js is not a real thing and this is probably a bug in our test harness setup. We should not making that network request.

[simonihmig]

@chancancode here we go: #17019