[Fusion] Document the operation kind annotation opt-in for request deduplication

[michaelstaib]

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[Copilot]

Pull request overview

This PR introduces (and documents) an opt-in mechanism for propagating the GraphQL operation kind onto outgoing subgraph HTTP requests so that downstream HTTP pipeline components—specifically request deduplication—can make decisions without parsing the request body.

Changes:

• Adds FusionRequestOptions.AnnotateOperationKind (default false) and wires it through the Fusion HTTP source schema client so it conditionally sets GraphQLHttpRequest.OperationKind.
• Updates Fusion performance tuning docs to explain the two required steps for deduplication: enabling operation-kind annotation in the gateway + adding the deduplication handler to the named HTTP client.
• Updates AddRequestDeduplication() XML docs to reflect the current signaling mechanism (HttpRequestMessage.Options / OperationKindOptionsKey).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
website/content/docs/fusion/performance-tuning.md	Documents the required opt-in and configuration steps for request deduplication.
src/HotChocolate/Fusion/src/Fusion.Execution/Execution/FusionRequestOptions.cs	Adds AnnotateOperationKind option and includes it in Clone().
src/HotChocolate/Fusion/src/Fusion.Execution/Execution/Clients/HttpSourceSchemaClientFactory.cs	Passes the schema request option into the HTTP source schema client.
src/HotChocolate/Fusion/src/Fusion.Execution/Execution/Clients/HttpSourceSchemaClient.cs	Conditionally sets GraphQLHttpRequest.OperationKind based on the new opt-in flag.
src/HotChocolate/AspNetCore/src/Transport.Http/RequestDeduplicationHttpClientBuilderExtensions.cs	Updates XML docs to match operation-kind signaling via HttpRequestMessage.Options.

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