Report needless disables in CI, bump stylelint, tidy scripts

[shawnbot]

This adds a call to stylelint --report-needless-disables to our lint test in Actions. I also bumped us to stylelint@^10.1.0 order to get the better output that @muan added in stylelint/stylelint#4071, and bumped a couple of other dev dependency versions while I was in there.

I've also removed the --unsafe-perm flags from calls to npm in our Actions workflows, since those were only necessary when we had pre- and post- scripts. (We seem to have gotten rid of all of those — maybe both after migrating from Next to Gatsby, then to Doctocat?)

TODO

• get this running and failing CI (see: this failure)
• fix the needless disables
• get it passing again

[vercel]

This pull request is automatically deployed with Now.
To access deployments, click Details below or on the icon next to each push.

Latest deployment for this branch: https://primer-css-git-needless-disables.primer.now.sh

[jonrohan]

This is great, especially the remove needless disables script