Remove Block Class module from Varbase Content Base recipe

Problem/Motivation

The Block Class module is no longer required in Varbase Content Base. Modern Drupal and Varbase rely on components, UI Patterns, and Canvas-based layouts for styling, making block-level CSS class management unnecessary. Keeping the module adds extra dependency and unused configuration.

Proposed resolution

Remove the Block Class module from Varbase Content Base, drop the dependency, and delete the unused configuration file.

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_content_base-1.0.0-alpha1

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• feat: #3586185 Remove Block Class module from Varbase Content Base recipe