Add a new NPM packaging workaround; remove the previous one

[webbnh]

Once again our build was broken by an external update to an NPM package. Happily, they were quick to fix it, so it's no longer necessary for us to work around the problem.

However, this PR commits the residue from that effort:

• First, we remove the workaround from the last time we had this firedrill, since it's no longer necessary.
• Second, we add a stub structure to hold the override for the next time (so we don't have to re-remember how to do it). (The form is different from the last time, because we're now running a current version of npm which supports it.)

[dbutenhof]

Interesting...

[portante]

Added the "DO NOT MERGE!!!" label until @MVarshini has had a chance to review and sign off.

[MVarshini]

All good!