[FLINK-36527][autoscaler] Introduce a parameter to support autoscaler adopt a more radical strategy when source vertex or upstream shuffle is keyBy

[huyuanfeng2018]

What is the purpose of the change

Introduce a parameter to support autoscaler adopt a more radical strategy when source vertex or upstream shuffle is keyBy

Brief change log

• Add a new option: scaling.key-group.partitions.adjust.mode
• Support use a more aggressive strategy（Resource utilization takes priority） to determine the degree of parallelism after Source or after keyby without first considering balanced consumption.

Verifying this change

in org.apache.flink.autoscaler.JobVertexScalerTest.JobVertexScalerTest

• testParallelismComputationWithAdjustment and testNumPartitionsAdjustment add logic to test

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 changes to the CustomResourceDescriptors: (yes / no)
• Core observer or reconciler logic that is regularly executed: (yes / no)

Documentation

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