Switch to Microsoft.CodeAnalysis.PublicApiAnalyzers for validation

[Copilot]

Migration to Microsoft.CodeAnalysis.PublicApiAnalyzers

• Add Microsoft.CodeAnalysis.PublicApiAnalyzers package to Directory.Build.props
• Create PublicAPI.Shipped.txt for Microsoft.OpenApi project (1,979 API entries)
• Create PublicAPI.Unshipped.txt for Microsoft.OpenApi project
• Create PublicAPI.Shipped.txt for Microsoft.OpenApi.YamlReader project (15 API entries)
• Create PublicAPI.Unshipped.txt for Microsoft.OpenApi.YamlReader project
• Remove PublicApiGenerator from test project
• Remove old PublicApi test directory and PublicApiTests.cs
• Update test project to remove references to old PublicApi files

Original prompt

---

This section details on the original issue you should resolve

<issue_title>switch to Microsoft.CodeAnalysis.PublicApiAnalyzers instead of custom unit test</issue_title>
<issue_description>Our PublicAPI validation logic was implemented a long time ago using a unit test.
While it "works" the dotnet team has now shipped Microsoft.CodeAnalysis.PublicApiAnalyzers which gives earlier feedback, has code fixes to automatically add new symbols to the lists and is more reliable.
We should migrate this repository so we can deliver a more robust experience.
Additionally, the yaml reader project is not covered by the unit test. We should also add the analyzers to this project to reduce the risk of public API breakages.</issue_description>

<agent_instructions>use conventional commits</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes switch to Microsoft.CodeAnalysis.PublicApiAnalyzers instead of custom unit test #2710

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud