Issue #3629653: Drupal 12 compatibility

Andrii Podanenkorequested to merge
issue/config_update-3629653:3629653-drupal-12-compatibility-2-0-x into 2.0.x

Drupal 12 readiness, for #3629653.

Adds ^12 to core_version_requirement and fixes code that breaks on Drupal 12 (see the issue).

Not run on a real Drupal 12 install yet; needs review.

Backlink: https://github.com/YCloudYUSA/yusaopeny/pull/388 (Drupal 12 readiness of the YMCA Website Services distribution).

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