This prevents accidental changes to package-lock.json when ESLint's setup runs 'npm install'.
Also revert the recent accidental changes to package-lock.json.
MozReview-Commit-ID: 21ebhOlQcMv
Differential Revision: https://phabricator.services.mozilla.com/D2118
--HG--
extra : moz-landing-system : lando
* Check update of displayItems, additionalDisplay items and total (via a modifier.)
MozReview-Commit-ID: B4L7Ev9yR2f
--HG--
extra : rebase_source : 98fb71b7a71f9f30106c78bd35b4f10ff8f179b6
Also use package-lock.json rather than npm-shrinkwrap.json as we no longer need to support the latter.
MozReview-Commit-ID: 4yaFcElvhF7
--HG--
rename : npm-shrinkwrap.json => package-lock.json
extra : rebase_source : ae6fcadd8b4a5213fb94cd6426909c2efebfb6a1