fix(event_handler): prevent deadlock when async middleware raises before calling next()

[leandrodamascena]

Issue number: closes #8187

Summary

In this PR I fix a deadlock in AsyncMiddlewareFrame that happens when a sync middleware raises an exception before calling next(). The asyncio.Event was never set, so await middleware_called_next.wait() would hang forever

Changes

Please provide a summary of what's being changed

User experience

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.72%. Comparing base (53678cf) to head (907db32).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8196   +/-   ##
========================================
  Coverage    96.72%   96.72%           
========================================
  Files          286      286           
  Lines        14342    14346    +4     
  Branches      1200     1201    +1     
========================================
+ Hits         13872    13876    +4     
  Misses         341      341           
  Partials       129      129           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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