chore: remove 3.9 samples test

[daniel-sanche]

Python 3.9 has been removed from kookoro. This PR removes the 3.9 samples CI test

[gemini-code-assist]

Summary of Changes

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This pull request streamlines the continuous integration pipeline by removing all configurations associated with Python 3.9 sample tests. This change reflects the deprecation of Python 3.9 support within the kookoro environment, ensuring that the CI system no longer attempts to run tests against an unsupported Python version.

Highlights

• Python 3.9 CI Test Removal: Removed all Kokoro CI configurations related to Python 3.9 sample tests, as Python 3.9 is no longer supported in the kookoro environment.

Changelog

• .kokoro/samples/python3.9/common.cfg
  • Removed the common configuration for Python 3.9 sample tests.
• .kokoro/samples/python3.9/continuous.cfg
  • Removed the continuous integration configuration for Python 3.9 sample tests.
• .kokoro/samples/python3.9/periodic-head.cfg
  • Removed the periodic-head configuration for Python 3.9 sample tests.
• .kokoro/samples/python3.9/periodic.cfg
  • Removed the periodic configuration for Python 3.9 sample tests.
• .kokoro/samples/python3.9/presubmit.cfg
  • Removed the presubmit configuration for Python 3.9 sample tests.

Activity

• No human activity detected in this pull request.

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[gemini-code-assist]

Code Review

This pull request correctly removes the Kokoro CI configuration for Python 3.9 sample tests. Given the PR description that 'Python 3.9 has been removed from kookoro', the removal seems incomplete. To fully remove Python 3.9 support, you might also need to remove '3.9' from UNIT_TEST_PYTHON_VERSIONS in noxfile.py and delete the corresponding testing/constraints-3.9.txt file.