Add jQuery modules
Refers to https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/723
Added:
- https://www.drupal.org/project/jquery_ui_accordion
- https://www.drupal.org/project/jquery_ui_datepicker
These modules are needed only for v9*. No need for back-porting in other versions.
Initial MR: !64 (closed)