Add enable_auto_prompt for user creation/modification endpoints

[juangw]

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Description

Add enable_auto_prompt for user creation/modification endpoints

Motivation and Context

Giving Kits the ability to disable/enable automatic factor selection is going GA in D288

How Has This Been Tested?

Manually calling endpoints with parameters to enable/disable

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)