[CIVIS-9014] implement "why this test was skipped" feature by adding ITR correlation to test events

[anmarchenko]

What does this PR do?
To show "why this test was skipped" explanation in the Datadog UI, we need to send itr_correlation_id field in content part of test events: this PR adds just that.

TestVisibility::Transport obtains itr_correlation_id by calling a method on ITR::Runner directly and then passes to serializers via new options keyword parameter.

How to test the change?
Tested using anmarchenko/jekyll project on dd-staging with the following result:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.06%. Comparing base (d0cfdc9) to head (f8d1a7c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #165   +/-   ##
=======================================
  Coverage   99.05%   99.06%           
=======================================
  Files         196      196           
  Lines        9340     9377   +37     
  Branches      404      407    +3     
=======================================
+ Hits         9252     9289   +37     
  Misses         88       88           

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