Fix logger propagation

[nikola-jokic]

Fixes #84

[Copilot]

Pull request overview

This PR is intended to address #84 (“logLevel/logFormat not respected; plain-text [DEBUG] GET ... logs emitted”) by ensuring the configured logger is propagated down to the underlying retryablehttp.Client instead of using its default logger.

Changes:

• Adds TestWithLogger subtests to validate WithLogger(nil) and custom logger behavior on httpClientOption.
• Adds tests intended to validate logger propagation to both built-in and custom retryable HTTP clients, including order-invariance for option application.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

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