Fix Ruby isStream always evaluating to false in CodeMethodWriter

[hobostay]

Summary

• Fix incorrect comparison in Ruby/CodeMethodWriter.cs where conventions.StreamTypeName.Equals(StringComparison.OrdinalIgnoreCase) was passing the StringComparison enum value instead of the returnType string
• This caused isStream to always be false, meaning Ruby SDKs generated by Kiota would never use send_primitive_async for stream/binary responses

Problem

The buggy code:

var isStream = conventions.StreamTypeName.Equals(StringComparison.OrdinalIgnoreCase);

This calls string.Equals(object, StringComparison) which compares the string "stdin" against the enum value StringComparison.OrdinalIgnoreCase. Since a string is never equal to an enum, this always returns false.

Fix

Aligns with all other language writers (CSharp, Python, Dart, PHP, TypeScript) which correctly compare the return type:

var isStream = conventions.StreamTypeName.Equals(returnType, StringComparison.OrdinalIgnoreCase);

Test plan

• Verify existing Ruby writer tests still pass
• Verify that Ruby code generation now correctly uses send_primitive_async for stream return types

🤖 Generated with Claude Code

[baywet]

Thanks for the contribution!