Fail benchmarks if any errors

[martincostello]

Fail the benchmarks if any errors are encountered during execution.

[Copilot]

Pull Request Overview

This PR adds error handling to fail the benchmarks if any errors are encountered during execution. The changes ensure that benchmark failures are properly propagated as non-zero exit codes.

• Modified the C# benchmark program to return exit code 1 if any benchmark reports indicate failure
• Updated the PowerShell script to check the exit code and fail the script execution if benchmarks failed

Reviewed Changes

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

File	Description
perf/TodoApp.Benchmarks/Program.cs	Captures benchmark summary and returns non-zero exit code when any reports indicate failure
benchmark.ps1	Adds exit code validation to propagate benchmark failures to the calling process

Comments suppressed due to low confidence (1)

perf/TodoApp.Benchmarks/Program.cs:26

• [nitpick] The lambda parameter 'p' is ambiguous. Consider using a more descriptive name like 'report' to improve code readability.

    return summary.Reports.Any((p) => !p.Success) ? 1 : 0;