[5.0.0] Make subscribers in EventProducer synchronized #1796
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Description
One Line Summary
Address ConcurrentModificationException crash by making subscribers in EventProducer synchronized
Details
Motivation
Customer issue of ConcurrentModificationException reported by Firebase Crashlytics while registering for push notifications.
Scope
Crash occurs while iterating over subscribers list in EventProducer.
Testing
Unit testing
No unit testing used for this fix. Future unit test could be written to create a multithreading environment.
Manual testing
Unable to reproduce original crash. Tested branch builds and push notifications registration is successful.
Affected code checklist
Checklist
Overview
Testing
Final pass
This change is