Let pointerup/cancel propagate in TouchManager

[calixteman]

During two-finger gestures, keep preventing the default action on pointerup/pointercancel, but don't stop propagation. Resize/drag sessions need those bubble events to clean up.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.98%. Comparing base (af38789) to head (0f999e2).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21674      +/-   ##
==========================================
- Coverage   89.99%   89.98%   -0.01%     
==========================================
  Files         263      263              
  Lines       66900    66901       +1     
==========================================
- Hits        60204    60199       -5     
- Misses       6696     6702       +6     

Flag	Coverage Δ
browsertest	66.52% <0.00%> (-0.01%)	⬇️
fonttest	9.04% <ø> (ø)
integrationtest	69.34% <100.00%> (-0.01%)	⬇️
unittest	57.83% <0.00%> (-0.01%)	⬇️
unittestcli	56.56% <0.00%> (+0.01%)	⬆️

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[timvandermeij]

Looks good; thank you for fixing this and for making sure we have a good way to test pinch actions now!