[OpenAPI] Prefer valid duplicate over invalid when deduping endpoints

[glen-84]

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[Copilot]

Pull request overview

This PR updates OpenAPI endpoint deduplication so that when multiple endpoint definitions share the same (HTTP method, route), a later valid endpoint can be preferred over an earlier invalid one, preventing a broken endpoint from “winning” just because it appears first.

Changes:

• Update endpoint selection logic in OpenApiDefinitionRegistry to prefer descriptors with a valid document when deduping by (method, route).
• Expose factory helpers to construct endpoint descriptors separately from ASP.NET endpoint wrapping (to support the new dedupe flow).
• Add an integration test + snapshot to cover “first invalid, second valid” duplicate route behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/HotChocolate/Adapters/test/Adapters.OpenApi.Tests/Endpoints/HttpEndpointIntegrationTestBase.cs	Adds coverage ensuring duplicate routes prefer the valid definition over an invalid one.
src/HotChocolate/Adapters/test/Adapters.OpenApi.Tests/Endpoints/__snapshots__/HttpEndpointIntegrationTestBase.Duplicated_Routes_FirstInvalidSecondValid_PrefersValid.snap	Snapshot asserting the valid endpoint is selected (HTTP 200 + expected body).
src/HotChocolate/Adapters/src/Adapters.OpenApi.Core/OpenApiDefinitionRegistry.cs	Implements new dedupe strategy based on descriptor validation outcome.
src/HotChocolate/Adapters/src/Adapters.OpenApi.Core/Execution/OpenApiEndpointFactory.cs	Makes descriptor/endpoint construction helpers callable from the registry.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.