chore: update eslint and stylelint configs and re-sync modern-normalize (#38982)

- update the vendored `modern-normalize` to v3.0.1
- require descriptions for lint disables in TS and CSS, same as we
already have in Go.
- disable core rules covered by `regexp/*` and `unicorn/*`, and ones
that cannot fire
- stop applying vitest rules to the playwright files in `tests/e2e`
- enable 7 stylelint rules, mostly `no-unknown` and `no-invalid` checks
- drop 2 unnecessary vendor prefixes (safari v17+, chrome v120+)
- look up ids via `querySelector` with `CSS.escape` instead of
`getElementById`
- remove stale doc about `@ts-expect-error`, it's forbidden
- misc dev doc fixes

Every declaration that `modern-normalize` v3 removes was checked against
chromium, webkit and firefox defaults first. The `hr` color and the
`:-moz-focusring` outline are kept as documented deviations, dropping
those does change rendering.

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

tools/eslint-rules/unescaped-html-literal.test.ts

@@ -1,6 +1,6 @@
 // MIT license, Copyright (c) GitHub, Inc.
 // https://github.com/github/eslint-plugin-github/blob/main/lib/rules/unescaped-html-literal.js
-/* eslint-disable no-template-curly-in-string */
+/* eslint-disable no-template-curly-in-string -- the fixtures are template literal sources inside plain strings */
 import rule from './unescaped-html-literal.ts';
 import {RuleTester} from 'eslint';