Refactor property-based tests

[martincostello]

Apply recommendations/fixes suggested by Copilot in #2830.

[Copilot]

Pull request overview

This PR applies fixes to property-based tests that were previously recommended in PR #2830, correcting test specifications and fixing a pragma directive issue.

• Corrected property-based test assertions to properly handle edge cases where values can equal boundaries
• Fixed test range calculations to accurately reflect actual implementation behavior
• Fixed mismatched pragma warning directive

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/Polly.Core.Tests/Retry/RetryHelperTests.cs	Corrected jitter delta calculation from /2 to /4, updated assertions to use ShouldBeGreaterThanOrEqualTo for edge cases, set floor to TimeSpan.Zero for DecorrelatedJitterBackoffV2 test, and changed maximum test value to 2048 (power of 2)
src/Polly.Core/Retry/RetryHelper.cs	Fixed pragma warning directive from disable to restore to properly close the warning suppression block

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (156a9bb) to head (3fb64f9).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2831   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         309      309           
  Lines        7123     7123           
  Branches     1005     1005           
=======================================
  Hits         6849     6849           
  Misses        221      221           
  Partials       53       53           

Flag	Coverage Δ
linux	96.15% <ø> (ø)
macos	96.15% <ø> (ø)
windows	96.14% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.