Rename Tests' timeout() function

[sebsto]

Fixes #553

[Copilot]

Pull Request Overview

This PR renames the timeout function to withTimeout in test utilities to improve naming consistency and clarity. The change addresses issue #553 by adopting a more descriptive function name that follows Swift naming conventions.

Key changes:

• Renamed timeout function to withTimeout in test utilities
• Updated all function call sites to use the new name
• Fixed a minor spelling error in a comment

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
Tests/AWSLambdaRuntimeTests/Timeout.swift	Renamed function from timeout to withTimeout
Tests/AWSLambdaRuntimeTests/LambdaRuntimeClientTests.swift	Updated function call to use new withTimeout name
Sources/AWSLambdaRuntime/LambdaRuntimeClient.swift	Fixed spelling error in comment ("eror" → "error")

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