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-desktop-download.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-desktop-download" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M8.75 5V.75a.75.75 0 00-1.5 0V5H5.104a.25.25 0 00-.177.427l2.896 2.896a.25.25 0 00.354 0l2.896-2.896A.25.25 0 0010.896 5H8.75zM1.5 2.75a.25.25 0 01.25-.25h3a.75.75 0 000-1.5h-3A1.75 1.75 0 000 2.75v7.5C0 11.216.784 12 1.75 12h3.727c-.1 1.041-.52 1.872-1.292 2.757A.75.75 0 004.75 16h6.5a.75.75 0 00.565-1.243c-.772-.885-1.193-1.716-1.292-2.757h3.727A1.75 1.75 0 0016 10.25v-7.5A1.75 1.75 0 0014.25 1h-3a.75.75 0 000 1.5h3a.25.25 0 01.25.25v7.5a.25.25 0 01-.25.25H1.75a.25.25 0 01-.25-.25v-7.5zM9.018 12H6.982a5.72 5.72 0 01-.765 2.5h3.566a5.72 5.72 0 01-.765-2.5z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-desktop-download" width="16" height="16" aria-hidden="true"><path d="m4.927 5.427 2.896 2.896a.25.25 0 0 0 .354 0l2.896-2.896A.25.25 0 0 0 10.896 5H8.75V.75a.75.75 0 1 0-1.5 0V5H5.104a.25.25 0 0 0-.177.427z"/><path d="M1.573 2.573a.25.25 0 0 0-.073.177v7.5a.25.25 0 0 0 .25.25h12.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25h-3a.75.75 0 1 1 0-1.5h3A1.75 1.75 0 0 1 16 2.75v7.5A1.75 1.75 0 0 1 14.25 12h-3.727c.099 1.041.52 1.872 1.292 2.757A.75.75 0 0 1 11.25 16h-6.5a.75.75 0 0 1-.565-1.243c.772-.885 1.192-1.716 1.292-2.757H1.75A1.75 1.75 0 0 1 0 10.25v-7.5A1.75 1.75 0 0 1 1.75 1h3a.75.75 0 0 1 0 1.5h-3a.25.25 0 0 0-.177.073zM6.982 12a5.72 5.72 0 0 1-.765 2.5h3.566a5.72 5.72 0 0 1-.765-2.5H6.982z"/></svg>