Switch to a Default Varbase API recipe and drop the use of the Module Installer Factory class in favour of Drupal Recipes

Problem/Motivation

Varbase API still installs via Vardot\Installer\ModuleInstallerFactory (install-list processing + config/permissions scan). The 10.1.x branch already switched to a Drupal core Recipe for this, see #3507413.

Steps to reproduce

Proposed resolution

Port the 10.1.x approach to 9.2.x: move the module install list and permission grants into recipes/default/recipe.yml, drop config/permissions/, and simplify varbase_api.install to just run the recipe.

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_api-9.2.0

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• task: #3608608 Switch to a Default Varbase API recipe and drop the use of the Module Installer Factory class