Improve Schema Error Details

[michaelstaib]

Fixes #9546

[Copilot]

Pull request overview

This PR improves schema discovery error diagnostics by adding a developer-facing “type inference path” that explains how an unresolved type reference was reached during type discovery, and by exposing that path in a structured error extension.

Changes:

• Add TypeInferencePathBuilder to build a root-to-leaf member chain for unresolved type references (short + namespace-qualified renderings, with truncation).
• Enhance TypeDiscoverer.CollectErrors() to append the short path to the error message and include the expanded path in error.Extensions["typePath"].
• Add/adjust tests and snapshot baselines to validate path formatting, truncation, and the new extension.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/HotChocolate/Core/src/Types/Configuration/TypeDiscoverer.cs	Formats unresolved-type errors deterministically and enriches them with a computed type inference path (message + extension).
src/HotChocolate/Core/src/Types/Configuration/TypeInferencePathBuilder.cs	New helper to locate and render member chains leading to a target TypeReference, including truncation and friendly type-name formatting.
src/HotChocolate/Core/src/Types/TypeErrorFields.cs	Adds the typePath extension key constant.
src/HotChocolate/Core/test/Types.Tests/Configuration/TypeDiscovererTests.cs	Adds tests for message path inclusion, typePath extension, friendly generic naming, and truncation behavior.
src/HotChocolate/Core/test/Types.Tests/Configuration/__snapshots__/TypeDiscovererTests.DiscoverTypes_Should_Append_PathToRoot_When_Nested_Member_Cannot_Be_Inferred.snap	New snapshot baseline for the enhanced error message format.
src/HotChocolate/Core/test/Types.Tests/Configuration/__snapshots__/TypeDiscovererTests.Cannot_Infer_Input_Type.snap	Updates snapshot baseline to reflect the new multi-line message with appended inference path.

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