Replace RClone sync by AWS CLI sync

[sanderegg]

After extensive testing in #5828 it showed that the AWS CLI is approximatively 1.5-2x faster at transferring data between local path and S3 than the current RClone sync used in dynamic-sidecar and agent.

It also is backed by AWS directly so should hopefuly be more stable (RClone 1.66.0 upgrade was a disaster as uploading would create kernel panics).

Since boto3 does not implement these tools, it would be needed to wrap the AWS CLI, checking whether there are any available tool already doing this might be worth the time.

Tasks

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1. Check for wrappers around AWS s3 sync call
2. implement wrapper of AWS s3 sync call with tests
3. ensure progress is parsed while transfering
4. replace rclone sync in dynamic-sidecar
5. replace rclone sync in agent