Added the builder to support the do-while task type

[Roruchi]

This PR introduces a builder that enables adding DO_WHILE tasks to workflow definitions, in line with the official Conductor documentation:
🔗 https://conductor-oss.github.io/conductor/documentation/configuration/workflowdef/operators/do-while-task.html

Highlights:

• Adds a DoWhileTaskBuilder and AddTask extension for clean integration into existing workflow definitions.
• Supports loop conditions
• Supports fluent configuration of inner tasks via standard builder patterns.
• Includes a safeguard that prevents nested DO_WHILE blocks, which are not currently supported by Conductor OSS.

Additionally:

Included an optional fix to allow unit tests to run reliably on some Windows environments.

This builder enables structured looping and retry logic directly within workflows, using native Conductor features in a strongly-typed, maintainable way. Looking forward to your review! 🙌

[boma96]

Thanks for submission, I left some comments you should check.

[Roruchi]

Thanks for your feedback @boma96, I have applied the fixes to the latest commit.

[boma96]

I don't see any issues with this, I hope you will find some problem which can be solved in elegant way using DO_WHILE loops. Will merge it.