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-code-review.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-code-review" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.5 2.75a.25.25 0 01.25-.25h12.5a.25.25 0 01.25.25v8.5a.25.25 0 01-.25.25h-6.5a.75.75 0 00-.53.22L4.5 14.44v-2.19a.75.75 0 00-.75-.75h-2a.25.25 0 01-.25-.25v-8.5zM1.75 1A1.75 1.75 0 000 2.75v8.5C0 12.216.784 13 1.75 13H3v1.543a1.457 1.457 0 002.487 1.03L8.061 13h6.189A1.75 1.75 0 0016 11.25v-8.5A1.75 1.75 0 0014.25 1H1.75zm5.03 3.47a.75.75 0 010 1.06L5.31 7l1.47 1.47a.75.75 0 01-1.06 1.06l-2-2a.75.75 0 010-1.06l2-2a.75.75 0 011.06 0zm2.44 0a.75.75 0 000 1.06L10.69 7 9.22 8.47a.75.75 0 001.06 1.06l2-2a.75.75 0 000-1.06l-2-2a.75.75 0 00-1.06 0z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-code-review" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.5 2.75a.25.25 0 0 1 .25-.25h12.5a.25.25 0 0 1 .25.25v8.5a.25.25 0 0 1-.25.25h-6.5a.75.75 0 0 0-.53.22L4.5 14.44v-2.19a.75.75 0 0 0-.75-.75h-2a.25.25 0 0 1-.25-.25v-8.5zM1.75 1A1.75 1.75 0 0 0 0 2.75v8.5C0 12.216.784 13 1.75 13H3v1.543a1.457 1.457 0 0 0 2.487 1.03L8.061 13h6.189A1.75 1.75 0 0 0 16 11.25v-8.5A1.75 1.75 0 0 0 14.25 1H1.75zm5.03 3.47a.75.75 0 0 1 0 1.06L5.31 7l1.47 1.47a.75.75 0 0 1-1.06 1.06l-2-2a.75.75 0 0 1 0-1.06l2-2a.75.75 0 0 1 1.06 0zm2.44 0a.75.75 0 0 0 0 1.06L10.69 7 9.22 8.47a.75.75 0 0 0 1.06 1.06l2-2a.75.75 0 0 0 0-1.06l-2-2a.75.75 0 0 0-1.06 0z"/></svg>