Pack analyzer per roslyn version

[koenbeuk]

fixes #205

[Copilot]

Pull request overview

This PR updates the NuGet packing process so the source generator + code fixes are built and packaged as separate analyzer assemblies per Roslyn version, allowing NuGet/MSBuild to pick a host-compatible analyzer at install/build time.

Changes:

• Build analyzer variants for Roslyn 4.8.0 and 5.0.0 during pack and place them under analyzers/dotnet/roslyn{X.Y}/cs/.
• Update the generator’s ROSLYN_5_0_OR_LATER conditional compilation symbol to be driven by $(RoslynAnalyzerVersion) instead of the host SDK version.
• Exclude canonical bin/ and obj/ from default compile globs in analyzer projects to avoid AssemblyInfo duplication during variant builds.

Reviewed changes

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

File	Description
src/EntityFrameworkCore.Projectables.Generator/EntityFrameworkCore.Projectables.Generator.csproj	Adjusts ROSLYN_5_0_OR_LATER definition to follow RoslynAnalyzerVersion and excludes bin/obj from default compile items.
src/EntityFrameworkCore.Projectables.CodeFixes/EntityFrameworkCore.Projectables.CodeFixes.csproj	Excludes bin/obj from default compile items to prevent duplicate compilation inputs during variant builds.
src/EntityFrameworkCore.Projectables.Abstractions/EntityFrameworkCore.Projectables.Abstractions.csproj	Adds pack-time targets to build Roslyn-specific analyzer variants and packs those DLLs into Roslyn-versioned analyzer folders.

[PhenX]

Thanks, I was looking for a way to fix it this way, but could not take a decision on the best way