[NuGet.org Bug]: Improve error message when packages are blocked by ID prefix reservation

[joelverhagen]

Impact

It's more difficult to complete my work

Describe the bug

The error message returned when a package ID is blocked due to an ID prefix reservation is this:

Response status code does not indicate success: 409 (The package ID is reserved. You can upload your package with a different package ID. Reach out to support@nuget.org if you have questions.).

This should actually mentioned account@nuget.org or link to https://docs.microsoft.com/en-us/nuget/nuget-org/id-prefix-reservation#id-prefix-reservation-application-process.

This will help users skip a step.

Source: NuGet/Home#11594 (comment)

Repro Steps

Push a package to a namespace you do not own, that has no owners.

Expected Behavior

The error message should be more direct to the action that will unblock the user.

Screenshots

No response

Additional Context and logs

No response