fix: request cannot have request body error

[ChiragAgg5k]

What does this PR do?

• fixes request cannot have body in ws connection
• fixes warnings for escaping keywords in argument list
  
• fixes warnings for not using error
  

Test Plan

Related PRs and Issues

• 🐛 Bug Report: WebSocketClientError (request cannot have request body) on Ios sdk-for-apple#82

Have you read the Contributing Guidelines on issues?

yes

[Copilot]

Pull Request Overview

This PR removes unintended request bodies for WebSocket connections and addresses Swift compiler warnings by adjusting keyword escaping and unused variables.

• Drop Content-Type, Content-Length, and empty body for WebSocket HTTP upgrade.
• Change if let error = error to if error != nil to resolve unused binding.
• Remove escapeSwiftKeyword on model properties (potentially breaking when names collide with Swift keywords).

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
templates/swift/Sources/WebSockets/HTTPHandler.swift.twig	Removed headers and body write to avoid sending a request body on WS
templates/swift/Sources/OAuth/WebAuthComponent.swift.twig	Simplified error check and corrected first(where:) usage for windows
templates/swift/Sources/Models/Model.swift.twig	Dropped keyword escaping in model generator (may cause identifier issues)

Comments suppressed due to low confidence (1)

templates/swift/Sources/Models/Model.swift.twig:85

• Removing escapeSwiftKeyword may lead to invalid Swift identifiers when a property name matches a reserved keyword. Reintroduce keyword escaping to avoid compile errors.

            {{ property.name | removeDollarSign }}: {% if property.sub_schema -%}