Custom Testing Improvements (2026-02-14)

Snapshot build based on upstream main with custom testing improvements:

• PR microsoft#25740: Pytest marks as tags - expose pytest marks (e.g., @pytest.mark.slow) as VS Code test tags (@python-tests:mark.slow)
• PR microsoft#25743: Respect TestRunRequest.exclude when running tests - properly filter excluded tests in Test Explorer

Based on upstream commit 502ad70 (Add support for Projects in Testing microsoft#25780).

Installation

code --install-extension ms-python-insiders.vsix

Then reload VS Code.