fix: change uninstall string check to boolean check

[millnut]

This fixes the following error:

1) Drupal\Tests\localgov\Functional\LocalGovProfileTest::testLocalGovDrupalProfile
Failed asserting that 'The following reasons prevent the modules from being uninstalled: The 'LocalGov Drupal' install profile requires 'LocalGov Core'; The install profile 'LocalGov Drupal' is providing the following module(s): localgov_login_redirect' contains "module is required".

/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:122
/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:56
/var/www/html/web/profiles/contrib/localgov/tests/src/Functional/LocalGovProfileTest.php:36
/var/www/html/vendor/phpunit/phpunit/src/Framework/TestResult.php:729

Prior to Drupal 10.3 the assert check was checking the error message contains module is required, with Drupal 10.3 the error message does not contain this string and is much longer.

The following reasons prevent the modules from being uninstalled: The 'LocalGov Drupal' install profile requires 'LocalGov Core'; The install profile 'LocalGov Drupal' is providing the following module(s): localgov_login_redirect

This PR changes the check to use a boolean and just checking if an error message exists.

The failure in the workflow that paratest hides the true error message, is fixed in a previous PR #736

[ekes]

Just hit re-run all jobs as there was a paratest - ie no idea what - phpunit fail. I'm assuming we're not expecting a fail on this?

[millnut]

Yep paratest hides the actual failures, when running phpunit one failure is #738 which is still failing and the other failure is fixed in this PR #736