Add option to keep the child process alive

[sebastienros]

No description provided.

[LoopedBard3]

Looks good 👍.

[Copilot]

Pull Request Overview

This PR adds functionality to optionally keep child processes alive after the main benchmark job completes. The feature allows users to specify whether a tracked child process should be terminated or kept running when the benchmark finishes.

• Adds a new KeepChildProcessAlive boolean property to the Job model with a default value of false
• Updates the EventSource API to accept an optional keepAlive parameter when setting child process IDs
• Modifies the job termination logic to skip killing child processes when the keep-alive flag is enabled

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Microsoft.Crank.Models/Job.cs	Adds the KeepChildProcessAlive property to the Job class
src/Microsoft.Crank.Jobs.Bombardier/Microsoft.Crank.Jobs.Bombardier.csproj	Updates C# language version to Latest
src/Microsoft.Crank.EventSources/Microsoft.Crank.EventSources.csproj	Updates C# language version to Latest
src/Microsoft.Crank.EventSources/BenchmarksEventSource.cs	Modifies SetChildProcessId method to accept optional keepAlive parameter
src/Microsoft.Crank.Controller/README.md	Documents the new --[JOB].keepChildProcessAlive command-line option
src/Microsoft.Crank.Controller/Documentation.cs	Adds documentation for the new keep-alive option
src/Microsoft.Crank.Agent/Startup.cs	Implements parsing logic and termination behavior for the keep-alive feature

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