AsyncBackend.run_in_thread(): Removed **kwargs and added abandon_on_cancel

[francis-clairicia]

What's changed

• It is no longer possible to call run_in_thread() with variadic keyword arguments
• Added keyword-only parameter abandon_on_cancel to permit task cancellation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (11bd710) to head (c90039c).
Report is 60 commits behind head on main.

Additional details and impacted files

Flag	Coverage Δ
OS-Linux	99.90% <100.00%> (+<0.01%)	⬆️
OS-Windows	99.78% <100.00%> (+<0.01%)	⬆️
OS-macOS	99.90% <100.00%> (+<0.01%)	⬆️
Py-3.11	99.90% <100.00%> (+<0.01%)	⬆️
Py-3.12	99.94% <100.00%> (+<0.01%)	⬆️
test-functional	81.76% <100.00%> (+<0.01%)	⬆️
test-unit	89.73% <100.00%> (+<0.01%)	⬆️

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