Add CI to the module.

PHPCs was fixed.
Created separate PHP Stan and PHP Unit fixes: ✨ Gitlab CI: PHP Stan and PHP Unit fixes Active

since #3445222 - good to merge

This MR introduced an error when running the Test ParagraphListingTest.

Not re-opening the issue as this has been fixed with the MR changes done in https://www.drupal.org/project/paragraphs_admin/issues/3443579 ✨ Paragraph delete should have confirm form Needs work (under review).

Test output -

www-data@c06cb4a3c870:/app/web/core$ ../../vendor/bin/phpunit ../modules/contrib/paragraphs_admin/tests/src/Functional/ParagraphListingTest.php --debug
PHPUnit 9.6.19 by Sebastian Bergmann and contributors.

Testing Drupal\Tests\paragraphs_admin\Functional\ParagraphListingTest
Test 'Drupal\Tests\paragraphs_admin\Functional\ParagraphListingTest::testParagraphListingPages' started
Test 'Drupal\Tests\paragraphs_admin\Functional\ParagraphListingTest::testParagraphListingPages' ended


Time: 00:10.387, Memory: 10.00 MB

There was 1 error:

1) Drupal\Tests\paragraphs_admin\Functional\ParagraphListingTest::testParagraphListingPages
TypeError: array_merge(): Argument #2 must be of type array, Drupal\user\Entity\User given

/app/web/modules/contrib/paragraphs/tests/src/Functional/WidgetLegacy/ParagraphsTestBase.php:89
/app/web/modules/contrib/paragraphs_admin/tests/src/Functional/ParagraphListingTest.php:48
/app/vendor/phpunit/phpunit/src/Framework/TestResult.php:729

ERRORS!
Tests: 1, Assertions: 9, Errors: 1.