[Fusion] Support coercing number without decimals to Float

[tobias-tengler]

No description provided.

[Copilot]

Pull request overview

This PR updates HotChocolate Fusion and the OpenAPI adapter to better handle GraphQL Float inputs provided as whole numbers (e.g., 500), aligning behavior across JSON variable coercion and HTTP query parameter parsing.

Changes:

• Allow IntValue literals to be treated as compatible when the target scalar expects Float in Fusion variable coercion.
• Correct spec scalar serialization types in Fusion composite schema building (e.g., Float => ScalarSerializationType.Float).
• Add OpenAPI adapter coverage for Float query parameters with and without decimals, and make numeric parsing culture-invariant.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/HotChocolate/Fusion/test/Fusion.AspNetCore.Tests/VariableCoercionTests.cs	Adds tests verifying Float variables accept whole numbers, 500.0, and fractional values.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/FusionScalarTypeDefinition.cs	Treats IntValue literals as compatible when a scalar’s value kind includes Float.
src/HotChocolate/Fusion/src/Fusion.Execution.Types/Completion/CompositeSchemaContext.cs	Assigns correct ScalarSerializationType for built-in spec scalars instead of always String.
src/HotChocolate/Adapters/test/Adapters.OpenApi.Tests/TestSchema.cs	Adds a query field used by new OpenAPI HTTP query parameter tests.
src/HotChocolate/Adapters/test/Adapters.OpenApi.Tests/Endpoints/HttpEndpointIntegrationTestBase.cs	Adds integration tests for Float query params (500 and 500.99).
src/HotChocolate/Adapters/test/Adapters.OpenApi.Tests/Endpoints/snapshots/HttpEndpointIntegrationTestBase.Http_Get_With_Query_Parameter_Float_Value.snap	Snapshot for whole-number float query parameter case.
src/HotChocolate/Adapters/test/Adapters.OpenApi.Tests/Endpoints/snapshots/HttpEndpointIntegrationTestBase.Http_Get_With_Query_Parameter_Float_Value_With_Decimals.snap	Snapshot for decimal float query parameter case.
src/HotChocolate/Adapters/src/Adapters.OpenApi.Core/Execution/DynamicEndpointMiddleware.cs	Uses InvariantCulture when parsing int/double from query/route string values.

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