Stop the functional testing CI job hiding composer failures

Problem/Motivation

The "Automated Functional Testing" job retries composer require and composer install 5 times each, then carries on whatever happened. A require that never succeeds only shows up later, as an unrelated error.

The composer install loop fails all 5 attempts on every run, green ones included: once composer require -W has unpacked the recipes, the lock no longer resolves (drupal/varbase_content_base ~1.0.0 could not be found).

Steps to reproduce

Search a green job log for "composer install attempt", for example job 12798852.

Proposed resolution

Do what varbase_search_base does: fail the job after 5 failed composer require attempts, and drop the separate composer install, since require already installs what it adds.

Remaining tasks

• ✅ File an issue
• ❌ Addition/Change/Update/Fix
• ❌ Testing to ensure no regression
• ➖ Automated unit/functional testing coverage
• ➖ Developer Documentation support
• ➖ User Guide Documentation support
• ➖ 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

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A