Update CI pipeline when Drupal 11 ships

Problem/Motivation

1. Reviewer currently requires Drupal 10.2 due to not providing plugin annotation classes, only attributes. This prevents us from using OPT_IN_TEST_PREVIOUS_MAJOR.
2. Reviewer makes use of PHP 8.2's readonly classes. This means we have to declare _TARGET_PHP: '8.2' for CI jobs.

Proposed resolution

With Drupal 11's release:

1. Add OPT_IN_TEST_PREVIOUS_MAJOR.
2. Remove _TARGET_PHP: '8.2'.