Better visibility into malformed ClearML responses

[Enkidu93]

If the response is not JSON, we include it properly in the exception message, but if it is JSON without the expected required properties, all we say is "Malformed response...". I don't see in the ClearML documentation how this would happen exactly, but I saw one of these errors on QA, so it can happen!

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This change is 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.93%. Comparing base (40290bc) to head (c6119b4).

Files with missing lines	Patch %	Lines
...c/Serval.Machine.Shared/Services/ClearMLService.cs	0.00%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #880      +/-   ##
==========================================
- Coverage   66.96%   66.93%   -0.04%     
==========================================
  Files         384      384              
  Lines       20889    20900      +11     
  Branches     2700     2709       +9     
==========================================
  Hits        13989    13989              
- Misses       5936     5947      +11     
  Partials      964      964              

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[ddaspit]

@ddaspit reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on Enkidu93).