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-package-dependencies.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-package-dependencies" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6.122.392a1.75 1.75 0 011.756 0l5.25 3.045c.54.313.872.89.872 1.514V7.25a.75.75 0 01-1.5 0V5.677L7.75 8.432v6.384a1 1 0 01-1.502.865L.872 12.563A1.75 1.75 0 010 11.049V4.951c0-.624.332-1.2.872-1.514L6.122.392zM7.125 1.69l4.63 2.685L7 7.133 2.245 4.375l4.63-2.685a.25.25 0 01.25 0zM1.5 11.049V5.677l4.75 2.755v5.516l-4.625-2.683a.25.25 0 01-.125-.216zm11.672-.282a.75.75 0 10-1.087-1.034l-2.378 2.5a.75.75 0 000 1.034l2.378 2.5a.75.75 0 101.087-1.034L11.999 13.5h3.251a.75.75 0 000-1.5h-3.251l1.173-1.233z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-package-dependencies" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6.122.392a1.75 1.75 0 0 1 1.756 0l5.25 3.045c.54.313.872.89.872 1.514V7.25a.75.75 0 0 1-1.5 0V5.677L7.75 8.432v6.384a1 1 0 0 1-1.502.865L.872 12.563A1.75 1.75 0 0 1 0 11.049V4.951c0-.624.332-1.2.872-1.514L6.122.392zM7.125 1.69l4.63 2.685L7 7.133 2.245 4.375l4.63-2.685a.25.25 0 0 1 .25 0zM1.5 11.049V5.677l4.75 2.755v5.516l-4.625-2.683a.25.25 0 0 1-.125-.216zm11.672-.282a.75.75 0 1 0-1.087-1.034l-2.378 2.5a.75.75 0 0 0 0 1.034l2.378 2.5a.75.75 0 1 0 1.087-1.034L11.999 13.5h3.251a.75.75 0 0 0 0-1.5h-3.251l1.173-1.233z"/></svg>