Honor [Subscribe(With = ...)] in source-generated subscriptions

[glen-84]

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[Copilot]

Pull request overview

Adds source generator support for the [Subscribe(With = nameof(...))] attribute on subscription resolvers, ensuring (1) the referenced stream-producing sibling method is excluded from being exposed as its own GraphQL field, and (2) the generated configuration sets SubscribeWith/SourceType so the runtime invokes the correct event stream.

Changes:

• WellKnownAttributes: added SubscribeAttribute constant.
• ObjectTypeInspector: pre-scans members for [Subscribe(With = ...)], builds a name set/lookup, skips referenced sibling methods, and propagates subscribeWith into the resolver model.
• Resolver model + TypeFileBuilderBase: added SubscribeWith and emit configuration.SubscribeWith / configuration.SourceType when present.
• Tests/snapshots: new generator and integration tests covering the subscribe-with behavior, ignored-method suppression, and live subscription delivery.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/HotChocolate/Core/src/Types.Analyzers/WellKnownAttributes.cs	Adds the SubscribeAttribute constant.
src/HotChocolate/Core/src/Types.Analyzers/Models/Resolver.cs	Adds SubscribeWith property and constructor parameter, threaded through WithSchemaTypeName.
src/HotChocolate/Core/src/Types.Analyzers/Inspectors/ObjectTypeInspector.cs	Collects [Subscribe(With=...)] references, suppresses the referenced sibling methods as fields, and forwards the value to CreateResolver.
src/HotChocolate/Core/src/Types.Analyzers/FileBuilders/TypeFileBuilderBase.cs	Emits configuration.SubscribeWith and configuration.SourceType when the resolver has a subscribe-with target.
src/HotChocolate/Core/test/Types.Analyzers.Tests/OperationTests.cs	Adds two generator tests for Subscribe-with and [GraphQLIgnore] interaction.
src/HotChocolate/Core/test/Types.Analyzers.Tests/snapshots/OperationTests.Subscription_With_Subscribe_With_Excludes_Stream_Method.md	New snapshot showing generated subscription wiring.
src/HotChocolate/Core/test/Types.Analyzers.Tests/snapshots/OperationTests.Subscription_Ignored_Method_Does_Not_Suppress_Public_Resolver.md	New snapshot verifying ignored stub doesn't suppress sibling field.
src/HotChocolate/Core/test/Types.Analyzers.Integration.Tests/Subscription.cs	New integration subscription type exercising both private and public subscribe sources.
src/HotChocolate/Core/test/Types.Analyzers.Integration.Tests/IntegrationTests.cs	Adds runtime subscription test and field-exposure test.
src/HotChocolate/Core/test/Types.Analyzers.Integration.Tests/snapshots/IntegrationTests.Schema_Snapshot.snap	Updates schema snapshot to include the new Subscription type.

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