Update JS dependencies (#15033)

* Update JS dependencies

- Update all JS dependencies
- For octicons, rename trashcan to trash
- For svgo, migrate to v2 api, output seems to have slightly changed but icons look the same
- For stylelint, update config, fix custom property duplicates
- For monaco, drop legacy Edge support
- For eslint, enable new rules, fix new issues
- For less-loader, remove deprecated import syntax

* update svgo usage in generate-images and rebuild logo.svg with it

public/img/svg/octicon-cpu.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-cpu" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6.5.75a.75.75 0 00-1.5 0V2H3.75A1.75 1.75 0 002 3.75V5H.75a.75.75 0 000 1.5H2v3H.75a.75.75 0 000 1.5H2v1.25c0 .966.784 1.75 1.75 1.75H5v1.25a.75.75 0 001.5 0V14h3v1.25a.75.75 0 001.5 0V14h1.25A1.75 1.75 0 0014 12.25V11h1.25a.75.75 0 000-1.5H14v-3h1.25a.75.75 0 000-1.5H14V3.75A1.75 1.75 0 0012.25 2H11V.75a.75.75 0 00-1.5 0V2h-3V.75zm5.75 11.75h-8.5a.25.25 0 01-.25-.25v-8.5a.25.25 0 01.25-.25h8.5a.25.25 0 01.25.25v8.5a.25.25 0 01-.25.25zM5.75 5a.75.75 0 00-.75.75v4.5c0 .414.336.75.75.75h4.5a.75.75 0 00.75-.75v-4.5a.75.75 0 00-.75-.75h-4.5zm.75 4.5v-3h3v3h-3z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-cpu" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6.5.75a.75.75 0 0 0-1.5 0V2H3.75A1.75 1.75 0 0 0 2 3.75V5H.75a.75.75 0 0 0 0 1.5H2v3H.75a.75.75 0 0 0 0 1.5H2v1.25c0 .966.784 1.75 1.75 1.75H5v1.25a.75.75 0 0 0 1.5 0V14h3v1.25a.75.75 0 0 0 1.5 0V14h1.25A1.75 1.75 0 0 0 14 12.25V11h1.25a.75.75 0 0 0 0-1.5H14v-3h1.25a.75.75 0 0 0 0-1.5H14V3.75A1.75 1.75 0 0 0 12.25 2H11V.75a.75.75 0 0 0-1.5 0V2h-3V.75zm5.75 11.75h-8.5a.25.25 0 0 1-.25-.25v-8.5a.25.25 0 0 1 .25-.25h8.5a.25.25 0 0 1 .25.25v8.5a.25.25 0 0 1-.25.25zM5.75 5a.75.75 0 0 0-.75.75v4.5c0 .414.336.75.75.75h4.5a.75.75 0 0 0 .75-.75v-4.5a.75.75 0 0 0-.75-.75h-4.5zm.75 4.5v-3h3v3h-3z"/></svg>