Target .NET 11 and EF Core 11 preview for an 11.0.0-preview.1 release

[Copilot]

Tracks .NET 11 support: brings the branch in line with master and retargets everything to .NET 11 / EF Core 11 preview so an 11.0.0-preview.1 package can be published (npgsql/efcore.pg preview releases used as reference).

Build & dependencies

• global.json: SDK 11.0.100-preview.7.26381.103, allowPrerelease: true
• Directory.Build.props: all target frameworks → net11.0 (MySqlConnector.DependencyInjection stays net8.0); benchmark and sample projects retargeted
• Directory.Packages.props: EF Core range [11.0.0-preview.7.26381.103,11.0.999], Microsoft.Extensions / ASP.NET Core / BCL packages → 11.0.0-preview.7.26381.103, Roslyn packages → 5.3.0 (required by Microsoft.EntityFrameworkCore.Design 11)
• NuGet.config: source mapping for Microsoft.DotNet.XUnitV3Extensions, which EF Core 11's specification-test package pulls in and is only published on the dotnet-eng feed
• Version.props → 11.0.0-preview.1; dotnet-tools.json → dotnet-ef 11.0.0-preview.7

Provider changes for EF Core 11 API breaks

• MySqlModelValidator: ValidateStoredProcedures is now invoked per entity type; ValidateJsonEntities was removed upstream (the override was a pass-through)
• MySqlHistoryRepository: HistoryRepository.EnsureModel is now protected virtual, so the custom implementation overrides it instead of shadowing it — the workaround region can eventually be reduced further
• MySqlStructuralJsonTypeMapping: JsonTypeMapping is obsolete/emptied; base changed to StructuralJsonTypeMapping
• MySqlJsonTableExpression / MySqlQueryableMethodTranslatingExpressionVisitor: TableValuedFunctionExpression.Arguments and Update now use Expression rather than SqlExpression
• MySqlBoolOptimizingExpressionVisitor: SqlExpressionVisitor was removed, so it derives from ExpressionVisitor and dispatches the SQL node types itself:

public class MySqlBoolOptimizingExpressionVisitor : ExpressionVisitor
{
    protected override Expression VisitExtension(Expression extensionExpression)
        => extensionExpression switch
        {
            ColumnExpression columnExpression => VisitColumn(columnExpression),
            SqlBinaryExpression sqlBinaryExpression => VisitSqlBinary(sqlBinaryExpression),
            // ... remaining SQL node types
            _ => base.VisitExtension(extensionExpression),
        };
}

Docs

• README compatibility table gains an 11.0.0-preview.1 row

Known gap

The test projects are not migrated to xUnit v3, which EF Core 11's specification-test assemblies now require (xunit.v3 packages, Microsoft.Testing.Platform, [ConditionalFact] → [Fact]). That migration is sizeable and could not be attempted here — the sandbox cannot reach the dotnet-eng package CDN, so the test projects don't even restore. Verification was limited to building/packing src, benchmark, samples, tools and exercising the provider against MySQL 8.0.40 (create/insert/query, ExecuteUpdate, owned-entity and complex-collection ToJson, history repository script generation).

• Fixes .Net 11 support #272

[bart-vmware]

I think this should be 7, to align with:

<EFCoreVersion>[11.0.0-preview.7.26381.103,11.0.999]</EFCoreVersion>

[renemadsen]

@copilot take this into consideration, so we are inline with the EF Core release numbering for the preview