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-image.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-image" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.75 2.5a.25.25 0 00-.25.25v10.5c0 .138.112.25.25.25h.94a.76.76 0 01.03-.03l6.077-6.078a1.75 1.75 0 012.412-.06L14.5 10.31V2.75a.25.25 0 00-.25-.25H1.75zm12.5 11H4.81l5.048-5.047a.25.25 0 01.344-.009l4.298 3.889v.917a.25.25 0 01-.25.25zm1.75-.25V2.75A1.75 1.75 0 0014.25 1H1.75A1.75 1.75 0 000 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0016 13.25zM5.5 6a.5.5 0 11-1 0 .5.5 0 011 0zM7 6a2 2 0 11-4 0 2 2 0 014 0z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-image" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.75 2.5a.25.25 0 0 0-.25.25v10.5c0 .138.112.25.25.25h.94a.76.76 0 0 1 .03-.03l6.077-6.078a1.75 1.75 0 0 1 2.412-.06L14.5 10.31V2.75a.25.25 0 0 0-.25-.25H1.75zm12.5 11H4.81l5.048-5.047a.25.25 0 0 1 .344-.009l4.298 3.889v.917a.25.25 0 0 1-.25.25zm1.75-.25V2.75A1.75 1.75 0 0 0 14.25 1H1.75A1.75 1.75 0 0 0 0 2.75v10.5C0 14.216.784 15 1.75 15h12.5A1.75 1.75 0 0 0 16 13.25zM5.5 6a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0zM7 6a2 2 0 1 1-4 0 2 2 0 0 1 4 0z"/></svg>