Formatting tweaks

[martincostello]

• Fix-up some formatting.
• Fix warning about using Lock for .NET 10+.

[Copilot]

Pull request overview

This PR focuses on small C# formatting cleanups in test utilities and tests, and introduces a conditional Lock type usage in FakeTelemetryListener to address .NET 10+ locking guidance/warnings while keeping older TFMs compatible.

Changes:

• Use target-typed new(...) construction in TestUtilities.AsObjectArguments.
• Add conditional Lock aliasing for non-.NET10 TFMs and update _syncRoot type accordingly.
• Add trailing commas in a few switch expressions / collection-like initializers to match formatting conventions.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/Polly.TestUtils/TestUtilities.cs	Minor formatting change to use target-typed new when constructing telemetry arguments.
test/Polly.TestUtils/FakeTelemetryListener.cs	Introduces conditional Lock usage for .NET 10+ and adjusts sync root type.
test/Polly.Core.Tests/Issues/IssuesTests.HandleMultipleResults_898.cs	Formatting tweak (adds trailing comma).
test/Polly.Core.Tests/Hedging/Controller/TaskExecutionTests.cs	Formatting tweak (adds trailing comma).
test/Polly.Core.Tests/Hedging/Controller/HedgingExecutionContextTests.cs	Formatting tweak (adds trailing comma).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.15%. Comparing base (dbe4eb7) to head (9cbdd16).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3017   +/-   ##
=======================================
  Coverage   96.15%   96.15%           
=======================================
  Files         310      310           
  Lines        7135     7135           
  Branches     1005     1005           
=======================================
  Hits         6861     6861           
  Misses        221      221           
  Partials       53       53           

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

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