task: Remove the legacy Behat tests and CircleCI from the Varbase profile now that automated testing moved to varbase_project

Problem/Motivation

The Varbase profile (10.1.x) still ships its own legacy Behat test suite (tests/, behat.yml) plus a CircleCI pipeline (.circleci/) to run it. Automated functional testing for Varbase has since moved to the Varbase project template (drupal/varbase_project), which now runs the equivalent coverage as BDD scenarios via webship-js (Playwright + Cucumber-js) on GitLab CI, alongside the strict-gating CI already rolled out to the varbase_* modules.

Keeping the profile's own Behat/CircleCI suite around now only duplicates coverage, requires a separate CI system (CircleCI, outside GitLab), and blocks moving the profile itself onto the same self-contained, strict-gating GitLab CI recipe already used elsewhere in the suite.

Precondition (already verified): all 44 .feature files under tests/features/varbase/** in the profile have been copied verbatim (identical paths and content) into drupal/varbase_project 10.1.x (branch 10.1.x-automated-testing, MR !27), so removing them from the profile loses no test coverage — the suite now lives in varbase_project and runs via webship-js.

Steps to reproduce

N/A — this is a maintenance/task issue, not a bug. To see the legacy suite being removed, browse tests/, behat.yml and .circleci/ on the varbase 10.1.x branch.

Proposed resolution

Remove the legacy Behat test tree and CircleCI configuration from the varbase profile 10.1.x branch, now that they are superseded by varbase_project + webship-js:

• tests/ — the entire Behat test tree: tests/features/** (including tests/features/varbase/** and tests/features/bootstrap/VarbaseContext.php, VarbaseSelectorsContext.php), tests/selectors/**, tests/tools/**, tests/assets/**, tests/README.md, tests/screenshots/**
• behat.yml — the Behat runner configuration
• .circleci/ — .circleci/config.yml and .circleci/env/varbase.test.conf
• composer.json — checked for Behat/Mink/drupal-extension/CircleCI-related require/require-dev deps and scripts/extra entries; none are present in the current 10.1.x composer.json, so no change is needed there

Nothing else is touched: varbase.info.yml, varbase.libraries.yml, varbase.services.yml, config/, src/, recipes/, the .gitlab/ CI templates, etc. all stay as-is.

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-10.1.1, varbase_project-10.1.1

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A

Release notes snippet

• N/A