Remove ImageAPI Optimize WebP module from Varbase Performance Base recipe and use Drupal core WebP support

Problem/Motivation

Requested by Jose

The Varbase Performance Base recipe depends on the imageapi_optimize_webp module for WebP optimization. Drupal core now includes native WebP support, making this dependency unnecessary.

Proposed resolution

• Remove imageapi_optimize_webp from Varbase Performance Base recipe.
• Use Drupal core WebP support for image generation and delivery.
• Update related configuration to rely on core image effects.
• Remove unused configuration referencing the module.

This simplifies dependencies and aligns Varbase Performance Base with Drupal core.

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
• ✅ Code review from 1 Varbase core team member
• ✅ Full testing and approval
• ✅ Credit contributors
• ✅ Review with the product owner
• ✅ Update Release Notes
• ❌ Release varbase-11.0.0-alpha1, varbase_starter-1.0.0-alpha1, varbase_performance_base-1.0.0-alpha1

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• chore: #3584520 Remove ImageAPI Optimize WebP module from Varbase Performance Base recipe and use Drupal core WebP support