Remove HotChocolate.OpenApi

[glen-84]

Summary of the changes (Less than 80 chars)

• Remove HotChocolate.OpenApi.

[Copilot]

Pull request overview

This PR removes the entire HotChocolate.OpenApi module — a library that provided OpenAPI-to-GraphQL schema translation and query execution. Note that this is distinct from HotChocolate.Adapters.OpenApi, which remains in the codebase and provides different OpenAPI adapter functionality.

Changes:

• Deletes all source code, tests, resources, snapshots, project files, and the solution file under src/HotChocolate/OpenApi/.
• Removes the InternalsVisibleTo entry for HotChocolate.OpenApi from HotChocolate.Utilities.csproj and the previously commented-out build entry in Helpers.cs.
• Removes the TestHotChocolateOpenApi build target from Build.Tests.2.cs.

Reviewed changes

Copilot reviewed 68 out of 69 changed files in this pull request and generated no comments.

File	Description
src/HotChocolate/Utilities/src/Utilities/HotChocolate.Utilities.csproj	Removes InternalsVisibleTo for the deleted project
.build/Helpers.cs	Removes the commented-out OpenApi path entry
.build/Build.Tests.2.cs	Removes the TestHotChocolateOpenApi build target
src/HotChocolate/OpenApi/** (all files)	Complete deletion of the OpenApi module source, tests, resources, snapshots, build props, and solution file

Files not reviewed (1)

• src/HotChocolate/OpenApi/src/HotChocolate.OpenApi/Properties/OpenApiResources.Designer.cs: Language not supported

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