Modify the shell for testing within Python.

Author: Chisanan232

.github/workflows/test_pyproject_ci_multi-tests_by_poetry.yaml

@@ -122,7 +122,7 @@ jobs:
       build-type: poetry
       python_package_name: Test-GitHub-Action-workflow
       test_shell: echo 'Test running'
-      test_shell_in_python: import test_gh_workflow
+      test_shell_in_python: from test_gh_workflow import sample
       test_python_script: ./scripts/ci/test/test_pgk_install.py