Add MIBC output mode to maui profile startup

[simonrozsival]

Follow-up to #60.

Summary

• add a new maui profile startup --format mibc flow
• install or build dotnet-pgo on demand and convert the collected .nettrace into a reusable .mibc profile
• enable the richer runtime/provider configuration needed for dynamic PGO data during Android startup tracing
• improve startup trace finalization and launch sequencing so the trace survives Ctrl+C and avoids the dsrouter startup race

Validation

• dotnet test src/Cli/Microsoft.Maui.Cli.UnitTests/Microsoft.Maui.Cli.UnitTests.csproj
• end-to-end run against ~/Downloads/TestDummy/TestDummy.csproj producing .nettrace, .etlx, and .mibc outputs

[Copilot]

Pull request overview

Adds a new MIBC output mode to maui profile startup, enabling collection of richer dynamic PGO startup data and converting the resulting .nettrace into a reusable .mibc profile via dotnet-pgo. It also adjusts the launch/trace sequencing and finalization behavior to reduce startup races and better survive user stop signals.

Changes:

• Add --format mibc support, including .nettrace → .mibc conversion and reference assembly resolution.
• Add on-demand dotnet-pgo installation/build-from-source flow with live status output.
• Improve trace lifecycle and launch sequencing (including retry behavior and post-processing after manual stop).

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/Cli/Microsoft.Maui.StartupProfiling/README.md	Documents the new mibc format and dotnet-pgo behavior.
src/Cli/Microsoft.Maui.Cli/Utils/ProcessRunner.cs	Adds stdout/stderr streaming callbacks for long-running operations.
src/Cli/Microsoft.Maui.Cli/Utils/DotnetPgoInstaller.cs	Implements dotnet-pgo discovery + build-from-source + install with status tailing.
src/Cli/Microsoft.Maui.Cli/Output/SpectreOutputFormatter.cs	Minor documentation/comment cleanup around StatusAsync overloads.
src/Cli/Microsoft.Maui.Cli/Commands/TraceOutputFormat.cs	Adds Mibc enum value.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileTraceOutputValidation.cs	Treats MIBC like other derived formats for output validation rules.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileTraceLifecycle.cs	Returns whether the user requested stop to drive post-processing cancellation behavior.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileSessionSetup.cs	Enables runtime PGO injection when output format is MIBC.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileSessionRunner.cs	Runs MIBC conversion and adjusts cancellation handling after manual stop.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileSessionLaunch.cs	Supports starting dotnet-trace after launch (with retry) to avoid dsrouter/connect races.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileSessionContext.cs	Introduces StartTraceAfterLaunch decision logic per platform.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileOutputResolver.cs	Adds mibc format parsing, prompting, and output path/sidecar behavior.
src/Cli/Microsoft.Maui.Cli/Commands/ProfileCommand.cs	Wires in MIBC flow, dotnet-pgo presence check, and conversion step.
src/Cli/Microsoft.Maui.Cli/Commands/DotnetTraceRunner.cs	Adds MIBC-specific provider/profile setup and trace-start retry path.
src/Cli/Microsoft.Maui.Cli/Build/MauiStartupProfilingInjection.targets	Updates Android/CoreCLR vs Mono runtime error messaging for nettrace/mibc.
src/Cli/Microsoft.Maui.Cli.UnitTests/ProfileCommandTests.cs	Adds unit coverage for MIBC format/path logic and dotnet-pgo installer helpers.

[simonrozsival]

@jfversluis please take a look when you have time

[jfversluis]

Congratulations on PR 100!