* API: Duplicate API Key Name Handle With Useful HTTP Code

* 17447: make changes requested during review

- use dialect.IsUniqueContraintViolation
- change if statement to match others
- return error properly

* Revert "17447: make changes requested during review"

This reverts commit a4a674ea83a9288701611f203f2a75531fb8a131.

* API: useful http code on duplicate api key error w/ tests

* API: API Key Duplicate Handling

fixed small typo associated with error