Auth: Duplicate API Key Name Handle With Useful HTTP Code (#17905)

* 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 a4a674ea83.

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

* API: API Key Duplicate Handling

fixed small typo associated with error

pkg/models/apikey.go

@@ -7,6 +7,7 @@ import (
 
 var ErrInvalidApiKey = errors.New("Invalid API Key")
 var ErrInvalidApiKeyExpiration = errors.New("Negative value for SecondsToLive")
+var ErrDuplicateApiKey = errors.New("API Key Organization ID And Name Must Be Unique")
 
 type ApiKey struct {
 	Id      int64