[D7 PHP 8.2] Deprecated function: Creation of dynamic property in DrupalWebTestCase->prepareEnvironment()

Problem/Motivation

In the DrupalWebTestCase->prepareEnvironment() there are more dynamic properties, which in PHP 8.2 results in these deprecation messages:

Deprecated function: Creation of dynamic property $originalLanguage is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1417 of /modules/simpletest/drupal_web_test_case.php)
Deprecated function: Creation of dynamic property $originalLanguageUrl is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1418 of /modules/simpletest/drupal_web_test_case.php)
Deprecated function: Creation of dynamic property $originalLanguageDefault is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1419 of /modules/simpletest/drupal_web_test_case.php)
Deprecated function: Creation of dynamic property $originalProfile is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1422 of /modules/simpletest/drupal_web_test_case.php)
Deprecated function: Creation of dynamic property $originalCleanUrl is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1423 of /modules/simpletest/drupal_web_test_case.php)
Deprecated function: Creation of dynamic property $public_files_directory is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1442 of /modules/simpletest/drupal_web_test_case.php)
Deprecated function: Creation of dynamic property $private_files_directory is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1443 of /modules/simpletest/drupal_web_test_case.php)
Deprecated function: Creation of dynamic property $temp_files_directory is deprecated in DrupalWebTestCase->prepareEnvironment() (line 1444 of /modules/simpletest/drupal_web_test_case.php)

Steps to reproduce

Run simpletest on PHP 8.2.

Proposed resolution

Add these missing properties to the DrupalWebTestCase class.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet