Seems dotnet uses v2 and this needs different handling

[robertpi]

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Motivation

The existing systems tests didn't work for .NET, it seems the format of telemetry changed and broke the tests.

Changes

• update the tests to handle the v2 telemetry format
• dotnet parametric tests docker image as wouldn't build locally

Reviewer checklist

• [ ] Relevant label (run-parametric-scenario, run-profiling-scenario...) are presents
• [ ] If PR title starts with [<language>], double-check that only <language> is impacted by the change
• [ ] No system-tests internal is modified. Otherwise, I have the approval from R&P team
• [ ] CI is green, or failing jobs are not related to this change (and you are 100% sure about this statement)
• [ ] A docker base image is modified?
  • [ ] the relevant build-XXX-image label is present
• [ ] A scenario is added (or removed)?
  • [ ] Get a review from R&P team