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-stop.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-stop" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4.47.22A.75.75 0 015 0h6a.75.75 0 01.53.22l4.25 4.25c.141.14.22.331.22.53v6a.75.75 0 01-.22.53l-4.25 4.25A.75.75 0 0111 16H5a.75.75 0 01-.53-.22L.22 11.53A.75.75 0 010 11V5a.75.75 0 01.22-.53L4.47.22zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5H5.31zM8 4a.75.75 0 01.75.75v3.5a.75.75 0 01-1.5 0v-3.5A.75.75 0 018 4zm0 8a1 1 0 100-2 1 1 0 000 2z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-stop" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4.47.22A.75.75 0 0 1 5 0h6a.75.75 0 0 1 .53.22l4.25 4.25c.141.14.22.331.22.53v6a.75.75 0 0 1-.22.53l-4.25 4.25A.75.75 0 0 1 11 16H5a.75.75 0 0 1-.53-.22L.22 11.53A.75.75 0 0 1 0 11V5a.75.75 0 0 1 .22-.53L4.47.22zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5H5.31zM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4zm0 8a1 1 0 1 0 0-2 1 1 0 0 0 0 2z"/></svg>