Internal: Fix failing phpunit tests [TMZ-1039]

[hein-obox]

✨ PR Description

1. Problem & Context

CI tests were failing due to overly complex conditional coverage logic. Simplified by removing conditional test runs and eliminating unnecessary coverage tooling.

2. What Changed (Where)

• .github/workflows/phpunit.yml: Removed COVERAGE env var and conditional test steps; now runs single unified composer run test command
• composer.json: Removed thor-juhasz/phpunit-coverage-check dependency and coverage-related scripts; kept yoast/phpunit-polyfills for PHP compatibility

3. How It Works

Test execution now unconditionally runs composer run test targeting the hello-elementor suite, eliminating matrix-dependent branch logic that was causing failures. Coverage checks were delegated or removed entirely.

4. Risks

Loss of coverage reporting if coverage enforcement was required downstream—verify coverage gates aren't assumed elsewhere. The yoast/phpunit-polyfills retention suggests PHP 8+ compatibility needs are still relevant; ensure no test incompatibilities emerge.

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