Follow-up from "Add support for nuget v2 OData package entry endpoints"

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Context

In !127667 (merged), we introduced ':project_id/packages/nuget/v2' namespace. Why we just didn't use the existing namespace ':id/packages/nuget/v2'? because one of the new Nuget endpoints is sending a query param named id. That created a conflict between the existing id param which is the project_id, and the received query string param named id.

Now we need to unify the two namespaces and change all references to the project_id to be referenced as project_id instead of id throughout all NuGet endpoints.