Issue #3072906 by bnjmnm, zrpnr, Wim Leers, lauriii, catch, mpdonadio, xjm,...

Issue #3072906 by bnjmnm, zrpnr, Wim Leers, lauriii, catch, mpdonadio, xjm, rainbreaw, andrewmacpherson, mgifford, anevins, jhedstrom: Deprecate jQuery UI datepicker

(cherry picked from commit 125a331d)

core/core.libraries.yml

@@ -550,6 +550,7 @@ jquery.ui.datepicker:
       assets/vendor/jquery.ui/themes/base/datepicker.css: {}
   dependencies:
     - core/jquery.ui
+  deprecated: The "%library_id%" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3081864
 
 jquery.ui.dialog:
   version: *jquery_ui_version

core/modules/locale/locale.libraries.yml

@@ -19,6 +19,7 @@ drupal.locale.datepicker:
     - core/jquery
     - core/drupal
     - core/drupalSettings
+  deprecated: The "%library_id%" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3081864
 
 translations:
   # No sensible version can be specified, since the translations may change at

core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php

@@ -148,6 +148,8 @@ public static function getSkippedDeprecations() {
       'The "core/matchmedia" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3086653',
       'The "core/matchmedia.addListener" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3086653',
       'The "core/classList" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use the the native browser implementation instead. See https://www.drupal.org/node/3089511',
+      'The "core/jquery.ui.datepicker" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3081864',
+      'The "locale/drupal.locale.datepicker" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3081864',
     ];
   }