breaking: move baseUrl to httpClient system options

[osoykan]

As it is not directly related with TestSytem, and main usage of base URL is scoped inside the httpClient validation dsl.

[github-actions]

Code Coverage

File	Coverage [93.95%]	✅
lib/stove-testing-e2e-http/src/main/kotlin/com/trendyol/stove/testing/e2e/http/HttpSystem.kt	92.81%	✅
lib/stove-testing-e2e/src/main/kotlin/com/trendyol/stove/testing/e2e/system/TestSystem.kt	97.92%	✅

Total Project Coverage	84.96%	✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.95%. Comparing base (fbad811) to head (5919b2a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #494      +/-   ##
==========================================
+ Coverage   83.91%   83.95%   +0.03%     
==========================================
  Files          83       83              
  Lines        2027     2025       -2     
  Branches       96       96              
==========================================
- Hits         1701     1700       -1     
+ Misses        262      261       -1     
  Partials       64       64              

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