Rethrow error thrown from withAsyncTestingChannel closure

[ahoppen]

Currently, when the closure of withAsyncTestingChannel throws, the error is just swallowed silently and the test passes. Actually rethrow it so the test fails

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.72%. Comparing base (4db2fde) to head (5971897).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #606      +/-   ##
==========================================
+ Coverage   75.42%   75.72%   +0.30%     
==========================================
  Files         134      134              
  Lines        9887     9912      +25     
==========================================
+ Hits         7457     7506      +49     
+ Misses       2430     2406      -24     

see 6 files with indirect coverage changes

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