Update jQuery to 3.7 and fix admintests (#5868)

* jQuery: Migrate to `.on()`, `.off()`, `.trigger()`

This avoids methods that are deprecated in newer versions of jQuery.

* jQuery: avoid `.removeAttr`, prefer `.prop`

* helper.edit: wait up to 10 seconds for ACCEPT_COMMIT

* Chat: disabled attribute is boolean

* Chat: avoid inline onclick handler to support jQuery 3.4+

* jQuery: update to version 3.6.0

* Update to 3.7

* Removed deprecated event.

* Revert change to focus on padeditor.ace

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Co-authored-by: webzwo0i <webzwo0i@c3d2.de>