[FLINK-28767][sql-gateway] Fix unstable SqlGatewayServiceITCase.testC…

[fsk119]

…ancelOperation

What is the purpose of the change

Fix unstable SqlGatewayServiceITCase.testCancelOperation. The main cause is the main thread tries to get the OperationStatus after canceling the execution. But the execution thread record the exception in async mode. It means the main thread will get the OperationStatus that may contains exception or not.

I think we don't need to record the exception if the thread is interrupted.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[flinkbot]

CI report:

• 22c9ecc38a9c62e135a9bbc969ceeb26a08b08da Azure: SUCCESS

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