Install weitzman/drupal-test-traits dependency for PHPStan to discover class

[gchi25]

Description

Install weitzman/drupal-test-traits dependency for PHPStan to discover class.

/var/www # vendor/bin/phpstan analyse -c phpstan.neon web/modules/custom/usagov_benefit_finder/tests/src/Functional/BenefitFinderTest.php

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Line tests/src/Functional/BenefitFinderTest.php

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12 Class Drupal\Tests\usagov_benefit_finder\Functional\BenefitFinderTest extends unknown class weitzman\DrupalTestTraits\ExistingSiteBase.
💡 Learn more at https://phpstan.org/user-guide/discovering-symbols

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The ExistingSiteBase class is part of the weitzman/drupal-test-traits package.

In USAGov local development site, I fix this error by followings:
composer require --dev weitzman/drupal-test-traits
composer dump-autoload

This ensures that PHPStan can discover classes provided by external packages.

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Acceptance Criteria

Install weitzman/drupal-test-traits dependency for PHPStan to discover class