PYTHON-6057 - Remove free-threaded variants from win32 tests

[NoahStapp]

PYTHON-6057

Changes in this PR

See ticket.

Test Plan

N/A.

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?

[Copilot]

Pull request overview

This PR updates Evergreen CI configuration generation to ensure the Win32 build variant does not run any tasks tagged as free-threaded, aligning Win32 test coverage with supported execution modes.

Changes:

• Update the config generator to exclude free-threaded tasks for the win32 standard non-linux variant.
• Regenerate Evergreen variant configuration to reflect the updated Win32 task selector.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.evergreen/scripts/generate_config.py	Adjusts Win32 variant task selection to add !.free-threaded exclusion.
.evergreen/generated_configs/variants.yml	Regenerated config: updates test-win32 tasks to exclude free-threaded.

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[blink1073]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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