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-inbox.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-inbox" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M2.8 2.06A1.75 1.75 0 014.41 1h7.18c.7 0 1.333.417 1.61 1.06l2.74 6.395a.75.75 0 01.06.295v4.5A1.75 1.75 0 0114.25 15H1.75A1.75 1.75 0 010 13.25v-4.5a.75.75 0 01.06-.295L2.8 2.06zm1.61.44a.25.25 0 00-.23.152L1.887 8H4.75a.75.75 0 01.6.3L6.625 10h2.75l1.275-1.7a.75.75 0 01.6-.3h2.863L11.82 2.652a.25.25 0 00-.23-.152H4.41zm10.09 7h-2.875l-1.275 1.7a.75.75 0 01-.6.3h-3.5a.75.75 0 01-.6-.3L4.375 9.5H1.5v3.75c0 .138.112.25.25.25h12.5a.25.25 0 00.25-.25V9.5z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-inbox" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M2.8 2.06A1.75 1.75 0 0 1 4.41 1h7.18c.7 0 1.333.417 1.61 1.06l2.74 6.395a.75.75 0 0 1 .06.295v4.5A1.75 1.75 0 0 1 14.25 15H1.75A1.75 1.75 0 0 1 0 13.25v-4.5a.75.75 0 0 1 .06-.295L2.8 2.06zm1.61.44a.25.25 0 0 0-.23.152L1.887 8H4.75a.75.75 0 0 1 .6.3L6.625 10h2.75l1.275-1.7a.75.75 0 0 1 .6-.3h2.863L11.82 2.652a.25.25 0 0 0-.23-.152H4.41zm10.09 7h-2.875l-1.275 1.7a.75.75 0 0 1-.6.3h-3.5a.75.75 0 0 1-.6-.3L4.375 9.5H1.5v3.75c0 .138.112.25.25.25h12.5a.25.25 0 0 0 .25-.25V9.5z"/></svg>