Update test_validate_cmd to include library_dirs parameter in do_validate_all_libraries_and_dry_run

Author: lchoquel

tests/e2e/pipelex/cli/test_validate_cmd.py

@@ -1,6 +1,8 @@
+from pathlib import Path
+
 from pipelex.cli.commands.validate_cmd import do_validate_all_libraries_and_dry_run
 
 
 class TestValidateCommand:
     def test_validate_all(self):
-        do_validate_all_libraries_and_dry_run()
+        do_validate_all_libraries_and_dry_run(library_dirs=[Path()])