Fix AsSelector throwing on types with only non-public constructors

[michaelstaib]

Closes #9666

[Copilot]

Pull request overview

Fixes a failure in SelectionExpressionBuilder where AsSelector<T> could throw for entity types that can’t be reconstructed via public constructors / public setters (notably types with only non-public constructors), by falling back to reusing the source instance instead of throwing.

Changes:

• Changed projection expression generation to return the source instance (context.Parent) as a last-resort fallback rather than throwing InvalidOperationException.
• Added a regression test covering projection with AsSelector over a type that has only private constructors and private setters.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/HotChocolate/Data/test/Data.Tests/ResolveWithProjectionTests.cs	Adds a regression test ensuring AsSelector works for types with only private constructors.
src/HotChocolate/Core/src/Execution.Projections/SelectionExpressionBuilder.cs	Replaces the throw-on-unconstructable-types behavior with a safe identity/reuse fallback.

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[github-actions]

Patch coverage

100.0% of changed lines covered (1/1)

File	Covered	Changed	Patch %
…/Core/src/Execution.Projections/SelectionExpressionBuilder.cs	1	1	100.0% 🟢

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Project coverage: 52.4% (215339/411051 lines)