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perf(storage/driver/s3-aws): improve HTTP client parameters for s3 storage driver

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What does this MR do?

This MR contains a minor optimization for the S3 driver that overrides the default parameter of the HTTP client.

Setting MaxIdleConnsPerHost to MaxIdleConns optimizes performance for HTTP clients making frequent requests to the same host. By default, Go's http.Transport sets MaxIdleConns to 100 (total idle connections) and MaxIdleConnsPerHost to 2. If multiple requests go to the same server, increasing MaxIdleConnsPerHost can enhance performance by allowing the reuse of idle connections, reducing latency, and using system resources efficiently.

Some references:

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Edited by Aleksandr Aleksandrov

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