Move analyzer PackageReferences to individual csproj files

[Chris-Wolfgang]

Summary

• Adds the 6 analyzer PackageReferences (Roslynator, AsyncFixer, Threading.Analyzers, BannedApiAnalyzers, Meziantou, SonarAnalyzer) directly to all 18 csproj files
• Each project now owns its analyzer references, eliminating the need to disable branch ruleset protection when updating versions

Prerequisites

• PR Remove analyzer PackageReferences from Directory.Build.props #127 must be merged first ("Remove analyzer PackageReferences from Directory.Build.props") to avoid duplicate analyzer references

Test plan

• Verify all 18 csproj files contain the 6 analyzer PackageReferences with correct versions
• Verify Directory.Build.props is NOT modified in this PR
• Build succeeds after both PRs are merged

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR moves the six analyzer PackageReferences (Roslynator, AsyncFixer, VS Threading Analyzers, BannedApiAnalyzers, Meziantou, SonarAnalyzer) from centralized configuration into individual project files so each project owns its analyzer dependencies.

Changes:

• Added the 6 analyzer PackageReferences (with PrivateAssets=all / IncludeAssets=...) to each touched .csproj.
• Applied the same analyzer versions consistently across library, tests, and example projects.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/Wolfgang.Etl.Abstractions.Tests.Unit/Wolfgang.Etl.Abstractions.Tests.Unit.csproj	Adds analyzer PackageReferences to the unit test project.
src/Wolfgang.Etl.Abstractions/Wolfgang.Etl.Abstractions.csproj	Adds analyzer PackageReferences to the core abstractions library.
examples/Net8.0/Example1-BasicETL/Example1-BasicETL.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net8.0/Example2-WithCancellationToken/Example2-WithCancellationToken.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net8.0/Example3-WithGracefulCancellation/Example3-WithGracefulCancellation.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net8.0/Example4a-WithExtractorProgress/Example4a-WithExtractorProgress.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net8.0/Example4b-WithTransformerProgress/Example4b-WithTransformerProgress.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net8.0/Example4c-WithLoaderProgress/Example4c-WithLoaderProgress.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net8.0/Example5a-ExtractorWithProgressAndCancellation/Example5a-ExtractorWithProgressAndCancellation.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net8.0/Example6-ReducingDuplicateCode/Example6-ReducingDuplicateCode.csproj	Adds analyzer PackageReferences to net8.0 example.
examples/Net4.8/Example1-BasicETL/Example1-BasicETL.csproj	Adds analyzer PackageReferences to net48 example.
examples/Net4.8/Example2-WithCancellationToken/Example2-WithCancellationToken.csproj	Adds analyzer PackageReferences to net48 example.
examples/Net4.8/Example3-WithGracefulCancellation/Example3-WithGracefulCancellation.csproj	Adds analyzer PackageReferences to net48 example.
examples/Net4.8/Example4a-WithExtractorProgress/Example4a-WithExtractorProgress.csproj	Adds analyzer PackageReferences to net48 example.
examples/Net4.8/Example4b-WithTransformerProgress/Example4b-WithTransformerProgress.csproj	Adds analyzer PackageReferences to net48 example.
examples/Net4.8/Example4c-WithLoaderProgress/Example4c-WithLoaderProgress.csproj	Adds analyzer PackageReferences to net48 example.
examples/Net4.8/Example5a-ExtractorWithProgressAndCancellation/Example5a-ExtractorWithProgressAndCancellation.csproj	Adds analyzer PackageReferences to net48 example.
examples/Net4.8/Example6-ReducingDuplicateCode/Example6-ReducingDuplicateCode.csproj	Adds analyzer PackageReferences to net48 example.