[FLINK-37372] Fix infinite loop bug in savepoint error handling #949
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What is the purpose of the change
A bug in the ExceptionUtils#findThrowableSerializedAware can cause it to enter an infinite loop if it cannot deserialize the SerializedThrowable error.
This affects the Kubernetes operator and can cause it to hang indefinitely.
Brief change log
Verifying this change
Unit test added
Does this pull request potentially affect one of the following parts:
CustomResourceDescriptors: noDocumentation
no