Document more EF11 provider-facing changes

[Copilot]

This update adds entries to ef-core-11.0/provider-facing-changes.md so provider authors see breaking changes early and can adapt their implementations without hunting through upstream API diffs.

• Provider-facing breaking change coverage

  • Added a new entry for PR #38440 (generic type mappings for NativeAOT).
  • Added a new entry for PR #38192 (keys and indexes traversing complex-type properties).

• Required actions for provider maintainers (now documented inline)

  • Migrate custom mappings to generic base types where applicable (CoreTypeMapping<T>, RelationalTypeMapping<T>).
  • Update CoreTypeMapping.Clone(...) / RelationalTypeMapping.Clone(...) usages and overrides for the removed clrType parameter.
  • Update code consuming index/key metadata, scaffolding/codegen, or custom validation to handle complex-type-spanning keys and indexes (broadened FindIndex/AddIndex signatures, new ModelValidator checks, ICSharpHelper additions).

• Test changes coverage

  • Added a new entry for PR #38277 (xUnit v2 → v3 upgrade in Specification.Tests assemblies).
  • Documents required migration steps: new xunit.v3 packages, Microsoft.DotNet.XUnitV3Extensions, Microsoft.Testing.Platform runner, Microsoft.NET.Test.Sdk; [Collection]/ITestOutputHelper API differences; [ConditionalFact]→[Fact] and [ConditionalTheory]→[Theory] renames; and dotnet exec filter flags (--filter-not-trait category=failing --ignore-exit-code 8).

• Doc metadata refresh

  • Updated page metadata date to reflect the new provider guidance.

[Copilot]

Pull request overview

Documents EF Core PR #38440 as a provider-facing breaking change for EF Core 11, so database provider maintainers can proactively update type mapping implementations for NativeAOT-related generics changes.

Changes:

• Updated page metadata date to reflect the new guidance.
• Added a provider-facing change entry describing the new generic type mapping base types and the Clone(...) signature change (removal of the clrType argument).