Simplify result uploading

[lucasmdrs]

Currently the JMeter master pods upload the results to S3 using a presigned URL once the Load Tests are done.
This process can be simplified by using a sidecar to upload those results.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ricardasomni]

+1