Add PHPStan ignore line to test

A line to ignore PHPStan analysis was added to the `findByExternalId('')` method call in the `ContactPersonRepositoryInterfaceTest.php` test. This annotative change helps to suppress the PHPStan error that's triggered by this particular line of testing code.

Signed-off-by: mesilov <[email protected]>

tests/Unit/Application/Contracts/ContactPersons/Repository/ContactPersonRepositoryInterfaceTest.php

@@ -442,6 +442,7 @@ final public function testFindByExternalIdWithEmptyId(
 
         $contactPersonRepository->save($contactPerson);
         $this->expectException(InvalidArgumentException::class);
+        /** @phpstan-ignore-next-line */
         $contactPersonRepository->findByExternalId('');
     }