[FLINK-22721][ha] Add default implementation for HighAvailabilityServices.cleanupJobData

[tillrohrmann]

In order to not break the HighAvailabilityServices interface, this commit adds a default
implementation for the HighAavilabilityServices.cleanupJobData method which does nothing.
Users of this interface are recommended to override this method and add a specific
implementation in order to clean up job specific HA services after a job completion.

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Last check on commit 7753542 (Sat Aug 28 12:11:01 UTC 2021)

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[XComp]

Looks good to me! 👍

[tillrohrmann]

Thanks for the review @XComp. Merging this PR now.