[SDTEST-172] Refactor configs and components

[anmarchenko]

What does this PR do?
Applies some refactorings:

• splits some code in components.rb in methods to make
• renames TestVisibility::Recorder to TestVisibility::Component
• renames ITR to TestOptimisation to make the name more generic
• renames ITR::Runner to TestOptimisation::Component

Motivation
There are some topics that require attention before adding telemetry to the mix

How to test the change?
Unit tests, no behavior change

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.15966% with 2 lines in your changes missing coverage. Please review.

Project coverage is 98.88%. Comparing base (fea0ea2) to head (f8f603b).

Files	Patch %	Lines
lib/datadog/ci/test_optimisation/component.rb	75.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage   98.88%   98.88%           
=======================================
  Files         231      231           
  Lines       10359    10368    +9     
  Branches      473      475    +2     
=======================================
+ Hits        10243    10252    +9     
  Misses        116      116           

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