Groundwork to align type systems.

[michaelstaib]

This PR does some ground work in shifting the Hot Chocolate core over to the new type system abstractions we are using in Mutable and Fusion.

[Copilot]

Pull Request Overview

This PR aligns the type system by replacing legacy definition types with new configuration types across HotChocolate’s core, caching, and Apollo Federation projects. Key changes include the removal of the deprecated IOutputType interface, updated method signatures to use TypeSystemConfiguration over DefinitionBase, and systematic renaming of properties and methods from “Definition” to “Configuration” for consistency.

Reviewed Changes

Copilot reviewed 607 out of 608 changed files in this pull request and generated no comments.

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File	Description
src/HotChocolate/Core/src/Abstractions/Types/IOutputType.cs	Removed the legacy IOutputType interface.
src/HotChocolate/Core/src/Abstractions/IHasReadOnlyContextData.cs	Updated XML comments for clarity.
src/HotChocolate/Core/src/Abstractions/Execution/ListPostProcessor.cs	Adjusted condition syntax with the new pattern matching style.
src/HotChocolate/Caching/...	Updated method signatures and type references from Definition to Configuration.
src/HotChocolate/ApolloFederation/...	Changed type references and method calls to use the new Configuration types across tests, directives, and resolvers.
src/HotChocolate/ApolloFederation/Resolvers/ArgumentParser.cs	Modified NonNullType handling to use the updated NullableType property.
src/HotChocolate/ApolloFederation/FederationTypeInterceptor.cs	Updated several method parameters and context data handling to reflect the new type system.

Files not reviewed (1)

• src/HotChocolate/Core/src/Abstractions/HotChocolate.Abstractions.csproj: Language not supported

Comments suppressed due to low confidence (1)

src/HotChocolate/ApolloFederation/src/ApolloFederation/Resolvers/ArgumentParser.cs:33

• Changing from 'nonNullType.Type' to 'nonNullType.NullableType' may affect how non-null types are handled; please verify that this change aligns with the updated type system semantics.

        type = type is NonNullType nonNullType ? nonNullType.NullableType : type;