Improve Calamari compile times

[sathvikkumar-octo]

Improve parallelism in the build by:

• Doing one solution wide restore upfront
• Build the whole solution so projects that aren't runtime specific are compiled.
• Build each runtime in parallel but each runtime is built sequentially
• Remove semaphores and per package compilation

Compile step improvement from ~15min to ~10min on CI

New
Old

[Copilot]

Pull request overview

This PR aims to reduce build/compile time overhead by reducing RID-related restore/build work and simplifying the build pipeline.

Changes:

• Removed RuntimeIdentifiers from Calamari.Azure to avoid generating RID-specific assets for a library project.
• Simplified the build restore step to a single dotnet restore call.
• Reworked Calamari packaging build to build the solution once, then publish per-RID with controlled parallelism.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
source/Calamari.Azure/Calamari.Azure.csproj	Removes RuntimeIdentifiers from the Azure library project to avoid RID asset generation.
build/Build.cs	Removes per-RID restore loop; relies on a single restore.
build/Build.PackageCalamariProjects.cs	Replaces per-project/per-RID build with a single solution build, then per-RID publish grouping.

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[Jtango18]

This looks promising to me. Will leave for the 👀 of @APErebus to make the final approve verdict though as there's definitely dragons he's familiar with here.

[APErebus]

Looks good! I did a build locally and no issues so let's ship it and see how it plays out.