Convert the procedural hooks to OOP hook classes in the Varbase Search module

Problem/Motivation

Drupal 11 introduced object-oriented hook implementations via the #[Hook] attribute (change record). Varbase Search targets Drupal ~11.4.0, so converting the procedural hooks to an OOP hook class improves structure and aligns with core.

Steps to reproduce

Proposed resolution

Move hook_form_entity_view_display_edit_form_alter() from varbase_search.module into src/Hook/VarbaseSearchHooks.php with a #[Hook] attribute. The form submit callback stays procedural (referenced by name). No #[LegacyHook] wrapper is needed on the 11.4-only branch.

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-9.2.0, varbase_search-9.2.0

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• task: #3608316 Convert the procedural hooks to OOP hook classes in the Varbase Search module