Allow reusability of test classes/methods across test solutions

[joaoopereira]

Currently, we have multiple plugins, each with its own set of test classes.
However, we have identified a need to reuse certain test classes/methods across different test solutions for improved efficiency and maintainability. This would enable us to avoid duplicating test code and ensure consistency in our testing approach. Therefore, we should create a nuget that allows for the reuse of specific test classes across multiple test solutions, providing flexibility and scalability in our testing efforts.