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-zap.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-zap" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M10.561 1.5a.016.016 0 00-.01.004L3.286 8.571A.25.25 0 003.462 9H6.75a.75.75 0 01.694 1.034l-1.713 4.188 6.982-6.793A.25.25 0 0012.538 7H9.25a.75.75 0 01-.683-1.06l2.008-4.418.003-.006a.02.02 0 00-.004-.009.02.02 0 00-.006-.006L10.56 1.5zM9.504.43a1.516 1.516 0 012.437 1.713L10.415 5.5h2.123c1.57 0 2.346 1.909 1.22 3.004l-7.34 7.142a1.25 1.25 0 01-.871.354h-.302a1.25 1.25 0 01-1.157-1.723L5.633 10.5H3.462c-1.57 0-2.346-1.909-1.22-3.004L9.503.429z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-zap" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M10.561 1.5a.016.016 0 0 0-.01.004L3.286 8.571A.25.25 0 0 0 3.462 9H6.75a.75.75 0 0 1 .694 1.034l-1.713 4.188 6.982-6.793A.25.25 0 0 0 12.538 7H9.25a.75.75 0 0 1-.683-1.06l2.008-4.418.003-.006a.02.02 0 0 0-.004-.009.02.02 0 0 0-.006-.006L10.56 1.5zM9.504.43a1.516 1.516 0 0 1 2.437 1.713L10.415 5.5h2.123c1.57 0 2.346 1.909 1.22 3.004l-7.34 7.142a1.25 1.25 0 0 1-.871.354h-.302a1.25 1.25 0 0 1-1.157-1.723L5.633 10.5H3.462c-1.57 0-2.346-1.909-1.22-3.004L9.503.429z"/></svg>