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-report.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-report" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.75 1.5a.25.25 0 00-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 01.75.75v2.19l2.72-2.72a.75.75 0 01.53-.22h6.5a.25.25 0 00.25-.25v-9.5a.25.25 0 00-.25-.25H1.75zM0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0114.25 13H8.06l-2.573 2.573A1.457 1.457 0 013 14.543V13H1.75A1.75 1.75 0 010 11.25v-9.5zM9 9a1 1 0 11-2 0 1 1 0 012 0zm-.25-5.25a.75.75 0 00-1.5 0v2.5a.75.75 0 001.5 0v-2.5z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-report" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.75 1.5a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.75.75 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25H1.75zM0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.457 1.457 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25v-9.5zM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0zm-.25-5.25a.75.75 0 0 0-1.5 0v2.5a.75.75 0 0 0 1.5 0v-2.5z"/></svg>