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-versions.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-versions" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.75 14A1.75 1.75 0 016 12.25v-8.5C6 2.784 6.784 2 7.75 2h6.5c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0114.25 14h-6.5zm-.25-1.75c0 .138.112.25.25.25h6.5a.25.25 0 00.25-.25v-8.5a.25.25 0 00-.25-.25h-6.5a.25.25 0 00-.25.25v8.5zM4.9 3.508a.75.75 0 01-.274 1.025.25.25 0 00-.126.217v6.5a.25.25 0 00.126.217.75.75 0 01-.752 1.298A1.75 1.75 0 013 11.25v-6.5c0-.649.353-1.214.874-1.516a.75.75 0 011.025.274zM1.625 5.533a.75.75 0 10-.752-1.299A1.75 1.75 0 000 5.75v4.5c0 .649.353 1.214.874 1.515a.75.75 0 10.752-1.298.25.25 0 01-.126-.217v-4.5a.25.25 0 01.126-.217z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-versions" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7.75 14A1.75 1.75 0 0 1 6 12.25v-8.5C6 2.784 6.784 2 7.75 2h6.5c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0 1 14.25 14h-6.5zm-.25-1.75c0 .138.112.25.25.25h6.5a.25.25 0 0 0 .25-.25v-8.5a.25.25 0 0 0-.25-.25h-6.5a.25.25 0 0 0-.25.25v8.5zM4.9 3.508a.75.75 0 0 1-.274 1.025.25.25 0 0 0-.126.217v6.5a.25.25 0 0 0 .126.217.75.75 0 0 1-.752 1.298A1.75 1.75 0 0 1 3 11.25v-6.5c0-.649.353-1.214.874-1.516a.75.75 0 0 1 1.025.274zM1.625 5.533a.75.75 0 1 0-.752-1.299A1.75 1.75 0 0 0 0 5.75v4.5c0 .649.353 1.214.874 1.515a.75.75 0 1 0 .752-1.298.25.25 0 0 1-.126-.217v-4.5a.25.25 0 0 1 .126-.217z"/></svg>