PYTHON-5924 Remove TestPyPI upload from release

[blink1073]

PYTHON-5924

Changes in this PR

Removes the TestPyPI upload step from the release workflow, which has started failing due to a PyPI policy change. Adds package metadata validation to the static CI job to help cover the gap.

Test Plan

Verified the new checks pass locally; relying on CI for the workflow changes themselves.

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR updates the project’s GitHub Actions workflows to remove the TestPyPI publish step (now failing due to external policy changes) and to compensate by adding local package metadata validation checks to CI.

Changes:

• Remove the “Publish to TestPyPI” step from the release workflow.
• Add pyproject.toml validation via validate-pyproject.
• Add package metadata validation via twine check on built distributions in the static CI job.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/test-python.yml	Adds validate-pyproject and twine check steps to the static CI job to validate packaging inputs/artifacts.
.github/workflows/release-python.yml	Removes the TestPyPI publish step while keeping the PyPI publish step intact.