Add Automated Testing for the Varbase Carousels module

Problem/Motivation

No automated testing yet to keep track of working behaviors and functionality
Issue may accrue on any update or install step like
#3222166: Fix Entity Storage Exception on Column not found: 1054 Unknown column field_media_carousel_slide_target_id in field list →

Proposed resolution

• Have automated testing with custom block and theme placement
• Have automated testing cases with inline block with Layout Builder pages

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
• ❌ Code review from 1 Varbase core team member
• ❌ Full testing and approval
• ❌ Credit contributors
• ❌ Review with the product owner
• ❌ Release

User interface changes

• None

API changes

• None

Data model changes

• None