API diff between .NET 9 GA and .NET 10 Preview1

[carlossanlop]

Repo area owners:

• ASP.NET - @dotnet/aspnet-api-review
• WinForms - @merriemcgaw @Tanya-Solyanik @JeremyKuhne
• WPF - @singhashish-wpf and @pchaurasia14
• Libraries - @artl93 @jeffschwMSFT @jeffhandley @karelz @ericstj @stephentoub @SamMonoRT

Libraries area owners:

• System.Collections @dotnet/area-system-collections
• System.Diagnostics @dotnet/area-system-diagnostics
• System.Formats.Asn1 @dotnet/area-system-formats-asn1
• System.Globalization @dotnet/area-system-globalization
• System.IO @dotnet/area-system-io
• System.Linq @dotnet/area-system-linq
• System.Net @dotnet/ncl
• System.Numerics @dotnet/area-system-numerics @dotnet/area-system-numerics-tensors
• System.Reflection @dotnet/area-system-reflection @dotnet/area-system-reflection-emit @dotnet/area-system-reflection-metadata
• System.Runtime @dotnet/area-system-runtime
• System.Runtime.InteropServices @dotnet/interop-contrib
• System.Runtime.Intrinsics @dotnet/area-system-runtime-intrinsics
• System.Security @dotnet/area-system-security
• System.Text.Json @dotnet/area-system-text-json
• System.Threading @dotnet/area-system-threading-channels @dotnet/area-system-threading-tasks @kouvel @mangod9
• System.Xml @dotnet/area-system-xml

Known api-diff tool issues:

If yo usee any of these, please provide a GitHub suggestion in this PR to correct it:

• The AsmDiff tool sometimes skips adding { or {} arcade#10981([AsmDiff] For attributes, move the +/- diff symbol to the attribute instead of the affected API arcade#13814)
• RequiresPreviewAttribute not getting auto added arcade#14498
• Changes to protected internal visibility should stop showing. AsmDiff: Do not show APIs with protected internal visibility arcade#14579
• The AsmDiff tool shows APIs with decorating attribute changes as removed and re-added, instead of showing only the API. Please ignore this, it might be confusing but technically it's not incorrect: [arcade#13814]

[tarekgh]

System.Globalization, System.StringNormalizationExtensions, and System.TimeSpan LGTM!

[kouvel]

System.Threading LGTM

[tannergooding]

System.Numerics LGTM

CC. @dotnet/area-system-numerics

[tannergooding]

System.Runtime.Intrinsics LGTM

CC. @dotnet/area-system-runtime-intrinsics

[tannergooding]

System LGTM

CC. @dotnet/area-system-runtime

[merriemcgaw]

@Tanya-Solyanik to double check on WinForms.
@carlossanlop please replace @lonitra on the list with @Tanya-Solyanik. @lonitra has changed teams 😭

[adamsitnik]

System.IO LGTM