Detect Ruuter functionalities that mix up responses

[turnerrainer]

Note

This is a sub-issue of #256

AS AN Architect
I WANT to have a clear overview of Ruuter functionalities that mix up responses
SO THAT I could develop a better understanding of where the problem lies and how to fix it

Acceptance Criteria

• Run at last 50 simultaneous requests per test
• Report results before updates
• Report results after updates / fixes

Scope

• All Ruuter DSL-based functionalities, such as listed here (but not limited to)