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-file-badge.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-file-badge" width="16" height="16" aria-hidden="true"><path d="M2.75 1.5a.25.25 0 00-.25.25v11.5c0 .138.112.25.25.25h3.5a.75.75 0 010 1.5h-3.5A1.75 1.75 0 011 13.25V1.75C1 .784 1.784 0 2.75 0h8a1.75 1.75 0 011.508.862.75.75 0 11-1.289.768.25.25 0 00-.219-.13h-8z"/><path fill-rule="evenodd" d="M8 7a4 4 0 116.49 3.13l.995 4.973a.75.75 0 01-.991.852l-2.409-.876a.25.25 0 00-.17 0l-2.409.876a.75.75 0 01-.991-.852l.994-4.973A3.993 3.993 0 018 7zm4-2.5a2.5 2.5 0 100 5 2.5 2.5 0 000-5zm0 6.5a4 4 0 001.104-.154l.649 3.243-1.155-.42c-.386-.14-.81-.14-1.196 0l-1.155.42.649-3.243A4 4 0 0012 11z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-file-badge" width="16" height="16" aria-hidden="true"><path d="M2.75 1.5a.25.25 0 0 0-.25.25v11.5c0 .138.112.25.25.25h3.5a.75.75 0 0 1 0 1.5h-3.5A1.75 1.75 0 0 1 1 13.25V1.75C1 .784 1.784 0 2.75 0h8a1.75 1.75 0 0 1 1.508.862.75.75 0 1 1-1.289.768.25.25 0 0 0-.219-.13h-8z"/><path fill-rule="evenodd" d="M8 7a4 4 0 1 1 6.49 3.13l.995 4.973a.75.75 0 0 1-.991.852l-2.409-.876a.25.25 0 0 0-.17 0l-2.409.876a.75.75 0 0 1-.991-.852l.994-4.973A3.993 3.993 0 0 1 8 7zm4-2.5a2.5 2.5 0 1 0 0 5 2.5 2.5 0 0 0 0-5zm0 6.5a4 4 0 0 0 1.104-.154l.649 3.243-1.155-.42c-.386-.14-.81-.14-1.196 0l-1.155.42.649-3.243A4 4 0 0 0 12 11z"/></svg>