Add Windows pre-cleanup to CI workflows

[tomchon]

Summary

• add a Windows-only init cleanup step to new-framework-test before prepare_test_env.py runs
• replace the old single-process cleanup in run-tests-on-windows with a broader taskkill-based cleanup
• reduce stale process interference with git clean, DLL usage, and leftover test artifacts

Testing

• verified the workflow diffs locally
• did not run the GitHub Actions workflows locally

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[Copilot]

Pull request overview

This PR updates Windows CI workflows to proactively terminate stale processes before test environment setup, reducing interference from locked DLL/log files and leftover artifacts on self-hosted runners.

Changes:

• Added a Windows-only “init environment” pre-cleanup step to new-framework-test before prepare_test_env.py.
• Replaced the prior targeted Python3 cleanup in run-tests-on-windows with a broader taskkill-based cleanup across multiple TDengine-related executables.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
.github/workflows/run-tests-on-windows.yml	Expands Windows pre-run cleanup from wmic-based python3-only termination to multi-image taskkill.
.github/workflows/new-framework-test.yml	Adds a Windows-only pre-cleanup step before environment preparation to reduce stale process interference.

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[feici02]

LGTM