[FLINK-8559][RocksDB] Release resources if snapshot operation fails

[zentol]

What is the purpose of the change

This PR ensures that RocksDB resources are released if RocksDBIncrementalSnapshotOperation#takeSnapshot throws an Exception.

We now catch the exception, cancel the SnapshotOperation, and re-throw the original exception.

Verifying this change

I've verified this manually by running JobManagerHACheckpointRecoveryITCase on Windows where takeSnapshot fails due to FLINK-8557.

I couldn't come up with proper test. The method hardly does anything in the first place and every solution i could think of would depend a lot on implementation details (like mocking Checkpoint.create() to throw an exception).

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

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

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

@StefanRRichter

[StefanRRichter]

LGTM

[zentol]

merging.