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-pin.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-pin" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4.456.734a1.75 1.75 0 012.826.504l.613 1.327a3.081 3.081 0 002.084 1.707l2.454.584c1.332.317 1.8 1.972.832 2.94L11.06 10l3.72 3.72a.75.75 0 11-1.061 1.06L10 11.06l-2.204 2.205c-.968.968-2.623.5-2.94-.832l-.584-2.454a3.081 3.081 0 00-1.707-2.084l-1.327-.613a1.75 1.75 0 01-.504-2.826L4.456.734zM5.92 1.866a.25.25 0 00-.404-.072L1.794 5.516a.25.25 0 00.072.404l1.328.613A4.582 4.582 0 015.73 9.63l.584 2.454a.25.25 0 00.42.12l5.47-5.47a.25.25 0 00-.12-.42L9.63 5.73a4.581 4.581 0 01-3.098-2.537L5.92 1.866z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-pin" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4.456.734a1.75 1.75 0 0 1 2.826.504l.613 1.327a3.081 3.081 0 0 0 2.084 1.707l2.454.584c1.332.317 1.8 1.972.832 2.94L11.06 10l3.72 3.72a.75.75 0 1 1-1.061 1.06L10 11.06l-2.204 2.205c-.968.968-2.623.5-2.94-.832l-.584-2.454a3.081 3.081 0 0 0-1.707-2.084l-1.327-.613a1.75 1.75 0 0 1-.504-2.826L4.456.734zM5.92 1.866a.25.25 0 0 0-.404-.072L1.794 5.516a.25.25 0 0 0 .072.404l1.328.613A4.582 4.582 0 0 1 5.73 9.63l.584 2.454a.25.25 0 0 0 .42.12l5.47-5.47a.25.25 0 0 0-.12-.42L9.63 5.73a4.581 4.581 0 0 1-3.098-2.537L5.92 1.866z"/></svg>