Stabilise NuGet project level test

What does this MR do and why?

Previously this test was deploying a nugget package to a project Package Registry and immediately attempting to use this package as a dependency in the same project. This change separates the process into two jobs to give enough time and separation for the background job to process the package upload.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.