Add unit test to verify call stacks on telemetry events

[narrieta]

While the issue in the telemetry events that include call stacks seems to be external to the agent, I am adding a test to verify that the Message of the event we send in the HTTP request matches the Message we read from the *.tld file.

The test *.tld file does repro the issue on Kusto.

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This change is 

[codecov]

Codecov Report

Merging #1828 into develop will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1828   +/-   ##
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  Coverage    69.04%   69.04%           
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  Files           82       82           
  Lines        11834    11834           
  Branches      1656     1656           
========================================
  Hits          8171     8171           
  Misses        3314     3314           
  Partials       349      349           

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[larohra]

Thanks for adding this test! LGTM