Pass timeout to TimeoutRejectedException

[martincostello]

Pass the value of timeout to TimeoutRejectedException in Polly for timeout policies.

Resolves #2815.

[Copilot]

Pull request overview

This PR enhances the TimeoutRejectedException by passing the timeout value that caused the exception, making it easier for consumers to understand and handle timeout scenarios.

• Timeout parameter is now passed to TimeoutRejectedException in both synchronous and asynchronous timeout engines
• Tests updated to verify the timeout value is correctly set in the exception

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/Polly/Timeout/TimeoutEngine.cs	Updated to pass timeout parameter when throwing TimeoutRejectedException
src/Polly/Timeout/AsyncTimeoutEngine.cs	Updated to pass timeout parameter when throwing TimeoutRejectedException in async scenarios
test/Polly.Specs/Timeout/TimeoutSpecs.cs	Added test assertion to verify timeout value is set correctly in pessimistic strategy
test/Polly.Specs/Timeout/TimeoutAsyncSpecs.cs	Added test assertion to verify timeout value is set correctly in async pessimistic strategy

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (50d19dd) to head (8eae0ff).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2827   +/-   ##
=======================================
  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% <100.00%> (ø)
macos	96.15% <100.00%> (ø)
windows	96.14% <100.00%> (ø)

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