Add `#description_display` to form elements that define a `#description`

Problem/Motivation

At the moment in many of the admin audit trail forms there is a PHP warning:

Warning: Undefined array key "#description_display" in template_preprocess_form_element() (line 490 of /app/web/core/includes/form.inc) #0 /app/web/core/includes/bootstrap.inc(104): _drupal_error_handler_real()
#1 /app/web/core/includes/form.inc(490): _drupal_error_handler()
#2 [internal function]: template_preprocess_form_element()
#3 /app/web/core/lib/Drupal/Core/Theme/ThemeManager.php(308): call_user_func_array()

This core preprocess function requires a position for the description if a description is defined.

Steps to reproduce

Proposed resolution

Remaining tasks

• ✅ File an issue
• ➖ Addition/Change/Update/Fix
• ➖ Testing to ensure no regression
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• ➖ Release notes snippet
• ❌ Release

API changes

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Data model changes

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Release notes snippet

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