Replace deprecated vscode-test with @vscode/test-electron #16765

Environment data

• VS Code version: XXX
• Extension version (available under the Extensions sidebar): XXX
• OS and version: XXX
• Python version (& distribution if applicable, e.g. Anaconda): XXX
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): XXX
• Relevant/affected Python packages and their versions: XXX
• Relevant/affected Python-related VS Code extensions and their versions: XXX
• Value of the python.languageServer setting: XXX

[NOTE: If you suspect that your issue is related to the Microsoft Python Language Server (python.languageServer: 'Microsoft'), please download our new language server Pylance from the VS Code marketplace to see if that fixes your issue]

Expected behaviour

Use @vscode/test-electron for CI

Actual behaviour

Use vscode-test for CI

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

1. XXX

Logs

XXX