AHS submission dry run or task validation.

**Describe the feature you'd like**
I want the ability to perform a dry run for AHS task submission. The idea would be to validate the task without actually submitting the task to the queue.

**How would this feature be used? Please describe.**
This would be useful to prototype tasks and help when submitting batches of tasks: validating all tasks before submitting them to the queue.

**Describe alternatives you've considered**
Not really any clear option to do this.