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-people.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-people" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M5.5 3.5a2 2 0 100 4 2 2 0 000-4zM2 5.5a3.5 3.5 0 115.898 2.549 5.507 5.507 0 013.034 4.084.75.75 0 11-1.482.235 4.001 4.001 0 00-7.9 0 .75.75 0 01-1.482-.236A5.507 5.507 0 013.102 8.05 3.49 3.49 0 012 5.5zM11 4a.75.75 0 100 1.5 1.5 1.5 0 01.666 2.844.75.75 0 00-.416.672v.352a.75.75 0 00.574.73c1.2.289 2.162 1.2 2.522 2.372a.75.75 0 101.434-.44 5.01 5.01 0 00-2.56-3.012A3 3 0 0011 4z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-people" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M5.5 3.5a2 2 0 1 0 0 4 2 2 0 0 0 0-4zM2 5.5a3.5 3.5 0 1 1 5.898 2.549 5.507 5.507 0 0 1 3.034 4.084.75.75 0 1 1-1.482.235 4.001 4.001 0 0 0-7.9 0 .75.75 0 0 1-1.482-.236A5.507 5.507 0 0 1 3.102 8.05 3.49 3.49 0 0 1 2 5.5zM11 4a.75.75 0 1 0 0 1.5 1.5 1.5 0 0 1 .666 2.844.75.75 0 0 0-.416.672v.352a.75.75 0 0 0 .574.73c1.2.289 2.162 1.2 2.522 2.372a.75.75 0 1 0 1.434-.44 5.01 5.01 0 0 0-2.56-3.012A3 3 0 0 0 11 4z"/></svg>