Update JS dependencies and webpack (#14118)

* Update JS dependencies

- Update all JS dependencies
- Adapt webpack config for version 5
- Update to Less 4.0, adapting usage of removed mixin syntax
- Enable new ESLint rules and fix discovered issues

* update license-webpack-plugin to fix missing licenses

* update license-webpack-plugin once more to get webpack into the license output

* switch to license-checker-webpack-plugin again for performance

* update deps again

Co-authored-by: Lauris BH <lauris@nix.lv>

web_src/less/_organization.less

@@ -17,7 +17,7 @@
   }
 
   &.new.org {
-    #create-page-form;
+    #create-page-form();
 
     form {
       .header {