Add testing guidelines for package features

Problem

When testing package stage features, it is common to use simple packages to test publishing and installation behavior. This does not simulate real world usage

Solution

When testing package features that involve package behavior, realistic packages should be used when manually testing functionality.

Actions

• Update the Package Team Page with a section on testing expectations
• Add a section to the development docs about working with package API code noting these test expectations
• Evaluate whether or not E2E testing should be implemented for this type of scenario