Fix projection of underlying ResolveWith member

[tobias-tengler]

Closes #9741

[Copilot]

Pull request overview

Fixes a regression where ResolveWith<T> on a field that shadows a runtime member of the parent type stopped projecting that underlying member, causing [UseProjection] parents to populate an empty/null member that the custom resolver then sees instead of the real data.

Changes:

• Adds a new CoreFieldFlags.MemberReplacement flag set by ObjectFieldDescriptor.ResolveWithInternal whenever a fluent ResolveWith overrides an existing Member.
• Updates the queryable projection handler and the SelectionExpressionBuilder (used by AsSelector) to keep projecting the underlying member when this flag is present.
• Adds tests covering both [UseProjection] and ISelection.AsSelector<T>() paths.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/HotChocolate/Core/src/Types/Types/Descriptors/Configurations/CoreFieldFlags.cs	Adds MemberReplacement flag (1L << 34).
src/HotChocolate/Core/src/Types/Types/Descriptors/ObjectFieldDescriptor.cs	Sets MemberReplacement when ResolveWith shadows an existing member.
src/HotChocolate/Data/src/Data/Projections/Expressions/Handlers/QueryableProjectionHandlerBase.cs	Treats member-replacement fields as projectable in CanProjectMember.
src/HotChocolate/Core/src/Execution.Projections/SelectionExpressionBuilder.cs	Includes member-replacement fields when building AsSelector projections; small readability refactor.
src/HotChocolate/Data/test/Data.Tests/ResolveWithProjectionTests.cs	New tests covering [UseProjection] and AsSelector paths for shadowed ResolveWith.

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