Avoid reporting false-positive StopAsyncIteration in the asyncio integration

[vmarkovtsev]

If a coroutine exits an async loop by raising AsyncStopIteration, Sentry reports it as an error. There is no error in that case.

[antonpirker]

Looks good. Thanks for the contribution!

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.57%. Comparing base (18d3899) to head (910c8c9).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
sentry_sdk/integrations/asyncio.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4741   +/-   ##
=======================================
  Coverage   84.57%   84.57%           
=======================================
  Files         158      158           
  Lines       16480    16482    +2     
  Branches     2855     2856    +1     
=======================================
+ Hits        13938    13940    +2     
- Misses       1695     1696    +1     
+ Partials      847      846    -1     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/asyncio.py	86.44% <50.00%> (-1.28%)	⬇️

... and 1 file with indirect coverage changes