memory leak after running Python tests

[iclite]

Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: 1.106.3 (user setup)
• OS Version: Windows_NT x64 10.0.26100

Steps to Reproduce:

1. 点击 Test -> 运行某个 test (python, pytest)
2. window 的内存占用持续增加, 我的测试很长，可能会持续几天，最后内存不足 vscode 无响应
3. 在主动点击结束测试，window 内存占用依然较高。

[vs-code-engineering]

AI Translation:

Title:

When using the testing feature, window memory usage keeps increasing

Body:

Does this issue occur when all extensions are disabled?: Yes/No

• VS Code Version: 1.106.3 (user setup)
• OS Version: Windows_NT x64 10.0.26100

Steps to Reproduce:

1. Click Test -> Run a test (python, pytest)
2. The window's memory usage keeps increasing. My tests are very long and may run for several days. Eventually, memory runs out and VS Code becomes unresponsive.
3. Even after manually clicking to end the test, window memory usage remains high.