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-smiley.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-smiley" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.5 8a6.5 6.5 0 1113 0 6.5 6.5 0 01-13 0zM8 0a8 8 0 100 16A8 8 0 008 0zM5 8a1 1 0 100-2 1 1 0 000 2zm7-1a1 1 0 11-2 0 1 1 0 012 0zM5.32 9.636a.75.75 0 011.038.175l.007.009c.103.118.22.222.35.31.264.178.683.37 1.285.37.602 0 1.02-.192 1.285-.371.13-.088.247-.192.35-.31l.007-.008a.75.75 0 111.222.87l-.614-.431c.614.43.614.431.613.431v.001l-.001.002-.002.003-.005.007-.014.019a1.984 1.984 0 01-.184.213c-.16.166-.338.316-.53.445-.63.418-1.37.638-2.127.629-.946 0-1.652-.308-2.126-.63a3.32 3.32 0 01-.715-.657l-.014-.02-.005-.006-.002-.003v-.002h-.001l.613-.432-.614.43a.75.75 0 01.183-1.044h.001z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-smiley" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.5 8a6.5 6.5 0 1 1 13 0 6.5 6.5 0 0 1-13 0zM8 0a8 8 0 1 0 0 16A8 8 0 0 0 8 0zM5 8a1 1 0 1 0 0-2 1 1 0 0 0 0 2zm7-1a1 1 0 1 1-2 0 1 1 0 0 1 2 0zM5.32 9.636a.75.75 0 0 1 1.038.175l.007.009c.103.118.22.222.35.31.264.178.683.37 1.285.37.602 0 1.02-.192 1.285-.371.13-.088.247-.192.35-.31l.007-.008a.75.75 0 1 1 1.222.87l-.614-.431c.614.43.614.431.613.431v.001l-.001.002-.002.003-.005.007-.014.019a1.984 1.984 0 0 1-.184.213c-.16.166-.338.316-.53.445-.63.418-1.37.638-2.127.629-.946 0-1.652-.308-2.126-.63a3.32 3.32 0 0 1-.715-.657l-.014-.02-.005-.006-.002-.003v-.002h-.001l.613-.432-.614.43a.75.75 0 0 1 .183-1.044h.001z"/></svg>