fix(batch): ensure Python 3.14 compatibility for async event loop handling

[leandrodamascena]

Issue number: closes #7397

Summary

This PR fixes event loop handling in AsyncBatchProcessor to be compatible with Python 3.14+, where asyncio.get_event_loop() will raise RuntimeError when called without a running event loop.

Changes

Please provide a summary of what's being changed

User experience

Please share what the user experience looks like before and after this change

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Disclaimer: We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.52%. Comparing base (22968fb) to head (1d8f790).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7599      +/-   ##
===========================================
+ Coverage    96.49%   96.52%   +0.03%     
===========================================
  Files          275      275              
  Lines        13110    13114       +4     
  Branches       985      985              
===========================================
+ Hits         12650    12658       +8     
+ Misses         356      353       -3     
+ Partials       104      103       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud