[Feature Request] Update YamlDotNet package to latest version

[filzrev]

Is your feature request related to a problem? Please describe.

YamlDotNet v16.x introduce breaking changes to public APIs
So it need to update related source codes to update YamlDotNet package.

And Docfx.YamlSerialization project using ILGenerator to call YamlDotNet APIs.
So it need to update related code also.

Describe the solution you'd like

• Update YamlDotNet to latest version.
• Remove ThreadLocal<YamlSerializer> code because YamlDotNet 16.1.0 or later supports call from multiple thread.

[filzrev]

Close this PR.

Because current code base is using YamlDotNet v16.x and test code will be fixed by #10974