AsyncAutoDelete is reset to 1 on sync of existing plugin step

[beyro]

Steps to reproduce:

1. In the PRT, uncheck the "Delete AsyncOperation if StatusCode = Successful" box for an async step.
2. Run dvx plugin sync

Expected Behaviour:

• AsyncAutoDelete remains set to 0

Actual Behaviour

• AsyncAutoDelete gets set to 1

Findings:

• StepRegistrar -> BuildStepEntity sets it true for all async plugins.
• This was intentional at first to force best practice of this setting with every sync. It can be manually adjusted for specific troubleshooting and then the next sync resets it. But perhaps it should be optional