AdvAgg uses legacy css.gzip / js.gzip configuration keys on Drupal 11.4.x

Issue Summary

Drupal 11.4 changed the system.performance configuration keys from css.gzip / js.gzip to css.compress / js.compress as part of the related Drupal core change in #3526344.

AdvAgg still reads and writes the legacy *.gzip keys.

On Drupal 11.4.x, when the site configuration contains the new css.compress / js.compress keys, AdvAgg continues to check the old css.gzip / js.gzip keys. As a result, AdvAgg can incorrectly determine that CSS/JS compression is disabled, even when compression is enabled in Drupal core.

This can cause compressed aggregated CSS/JS files not to be generated, without any error.

The AdvAgg settings form is also affected:

• Default values are read from the legacy css.gzip / js.gzip keys.
• Saving the form writes to the legacy keys instead of the current css.compress / js.compress keys.

Steps to reproduce

1. Install Drupal 11.4.x and enable AdvAgg.
2. Enable CSS and/or JavaScript compression in Drupal's system.performance configuration, or import configuration containing:

• css.compress: true
• js.compress: true

Expected result

AdvAgg should use Drupal 11.4.x's current system.performance configuration keys and honor css.compress / js.compress when compression is enabled.

The AdvAgg settings form should also read from and save to the current configuration keys.

Actual result

AdvAgg reads the legacy css.gzip / js.gzip keys.

When those keys are not populated on a Drupal 11.4.x site, AdvAgg can treat compression as disabled even though css.compress / js.compress are enabled in Drupal core.

The AdvAgg settings form can also write the legacy keys instead of the current keys.

Proposed resolution

Update AdvAgg to:

• Read css.compress / js.compress on Drupal 11.4.x.
• Fall back to css.gzip / js.gzip where necessary for compatibility with supported older Drupal versions.
• Update the AdvAgg settings form to use the current *.compress configuration keys.
• Add or update automated tests to cover the Drupal 11.4.x configuration keys and, where applicable, backward compatibility with older configuration.