CAMEL-23123: Fix S3Presigner ignoring forcePathStyle configuration

[Croway]

Description

• Extract duplicated S3Presigner creation logic from createDownloadLink() and createUploadLink() into a shared getOrCreatePresigner() helper method
• Apply forcePathStyle to the presigner via S3Configuration.pathStyleAccessEnabled(true) when the option is enabled
• Add integration test verifying path-style vs virtual-hosted-style presigned URL generation

[github-actions]

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