[FLINK-31406] Do not delete jobgraph on scale only last-state upgrades #968
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What is the purpose of the change
Retain job graph on Scale only last state upgrades.
Brief change log
Add mechanism to detect upgrade for SCALE only diff using lastStableSpec. retain job graph if Scale only last state upgrade.
Verifying this change
New unit tests added to cover this
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 changes to the CustomResourceDescriptors: no
Core observer or reconciler logic that is regularly executed: yes