test: Improve SentryHttpStatusCodeRange tests

[philipphofmann]

Summary

• Add property verification tests for both initWithMin:max: and initWithStatusCode: to catch assignment bugs that isInRange alone might miss
• Add boundary tests (min == max, inverted range) to cover conditional branches not exercised by the original mid-range and far-away values
• Adopt test<Function>_when<Condition>_should<Expected> naming convention for self-documenting test names

#skip-changelog

Closes #7679

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.896%. Comparing base (6f3e05f) to head (c47d449).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #7678       +/-   ##
=============================================
+ Coverage   85.307%   85.896%   +0.589%     
=============================================
  Files          485       485               
  Lines        28837     28837               
  Branches     12521     12526        +5     
=============================================
+ Hits         24600     24770      +170     
+ Misses        4190      4019      -171     
- Partials        47        48        +1     

see 6 files with indirect coverage changes

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[itaybre]

LGTM