Include VPP token location in APP response error

[gillespi314]

Issues #9956 and #21309

• [x] Update the error response for POST /vpp_tokensto provide the information needed to support this UI. image.png. the current error response is this { "message": "vpp token for team noteam already exists", "errors": [ { "name": "base", "reason": "vpp token for team noteam already exists" } ] }

[gillespi314]

No changes needed. This was included in latest iteration feature branch:

[fleet-release]

VPP token placed, Errors guide like stars do, Smooth path in cloud city.

[fleet-release]

VPP token shines, In error's response it lies, Clarity aligns.