SystemTests: avoid unneeded assemblies copies in Testprojects

[obligaron]

What's changed?

This PR reduces the number of assemblies copied to the bin directory by the TestProjectGenerator in the system tests. This happens because

• Fewer nuget packages are referenced
• Satellite assemblies are not copied

This reduces the bin directory size of a typical test project from 4.91 MB (98 files) to 2.46 MB (28 files).

⚡️ What's your motivation?

To improve system test execution time and reduce test project dependencies (and therefore complexity).
Interestingly, on my machine, the execution time didn't change that much. But I still think the change is a win because we have less I/O and the generated projects have fewer dependencies to maintain and understand.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing behaviour)

♻️ Anything particular you want feedback on?

I have checked that all tests run successfully on my local machine and on CI. But I'm not sure if all the tests run on CI.

📋 Checklist:

• I've changed the behaviour of the code

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[gasparnagy]

looks good