fix: check for challenges in create account controller

[tessstoddard]

Summary of Changes

Adds logic to check for challenges in the create account call. If there are challenges return a 202 instead of 200

How Has This Been Tested?

I tested this locally. Verifying that we return a 200 if there are no challenges and a 202 if there are challenges

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works