Add HttpMethod.Query to static method test data

[NicoAvanzDev]

Summary

• Add HttpMethod.Query to the shared static HttpMethod test data.
• Ensure the static-method hash-code coverage includes the QUERY singleton.

Testing

• .\build.cmd -subset clr+libs -rc Release
• .\dotnet.cmd test src\libraries\System.Net.Http\tests\FunctionalTests\System.Net.Http.Functional.Tests.csproj --filter FullyQualifiedName~HttpMethodTest

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Pull request overview

Updates the HttpMethodTest functional tests to include the HttpMethod.Query singleton in the shared static-method test data used by the hash-code theory, improving coverage consistency for built-in HttpMethod instances.

Changes:

• Add HttpMethod.Query to the StaticHttpMethods test data set used by [MemberData].
• Update the static-method list formatting to accommodate the new entry.