Convert hooks to the Drupal 11 OOP hook system and validate on Drupal ~11.4 for the Varbase 9.2.x line

Problem/Motivation

Varbase Dashboards is used by Varbase 9.2.x (Drupal ~11.4). Its varbase_dashboards.module still implements hooks procedurally (hook_page_attachments, hook_theme, hook_theme_registry_alter, hook_preprocess_HOOK) using \Drupal:: static calls.

Drupal 11 provides an object-oriented hook system (https://www.drupal.org/node/3442349); the CI composer job also builds on the template-default core rather than the pinned Drupal ~11.4.

Steps to reproduce

Proposed resolution

Move the module's hooks into an OOP src/Hook/VarbaseDashboardsHooks.php class with dependency injection (register in varbase_dashboards.services.yml), delete the procedural .module (keep only non-hook helpers if any).

Pin the CI composer job to Drupal 11.4.0 (job-level DRUPAL_CORE/IGNORE_PROJECT_DRUPAL_CORE_VERSION) so it validates on ~11.4, and keep the webship-js browser suite green.

Remaining tasks

• ✅ File an issue about this project
• ✅ Addition/Change/Update/Fix to this project
• ✅ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support on feature change/addition
• ➖ User Guide Documentation support on feature change/addition
• ➖ UX/UI designer responsibilities
• ➖ Accessibility and Readability
• ❌ Reviewed by a human
• ❌ Code review by maintainers
• ❌ Full testing and approval
• ❌ Credit contributors
• ❌ Review with the product owner
• ✅ Update Release Notes
• ✅ Release varbase-10.1.1, varbase_dashboards-2.0.2

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A