HDDS-10947. Add robot test for rewrite of multipart key

[adoroszlai]

What changes were proposed in this pull request?

This PR adds coverage for rewrite of key created via multipart upload. The test can be expanded later for other cases, but atomic key rewrite is already (mostly) covered by integration tests for regular keys.

Most of this change is making some custom robot test keywords available for tests outside S3 tests.

https://issues.apache.org/jira/browse/HDDS-10947

How was this patch tested?

CI:
https://github.com/adoroszlai/ozone/actions/runs/9317350415/job/25648077188#step:5:366

Verified that the key was originally created via multipart upload:

2024-05-31 16:26:22,635 | INFO  | OMAudit | user=dlfknslnfslf | ip=192.168.96.9 | op=INITIATE_MULTIPART_UPLOAD {volume=s3v, bucket=bucket-bcqjqldpje, key=multipart.key, dataSize=0} | ret=SUCCESS |  
2024-05-31 16:26:23,441 | INFO  | OMAudit | user=dlfknslnfslf | ip=192.168.96.9 | op=COMMIT_MULTIPART_UPLOAD_PARTKEY {volume=s3v, bucket=bucket-bcqjqldpje, key=multipart.key, dataSize=4194304, ETag=7e545caeb052915b4e76bbdf290c5c3a, partNumber=2, partName=/s3v/bucket-bcqjqldpje/multipart.key-0ac48c33-a70c-4cd0-935a-e2322d7495e2-112536635482112000-2} | ret=SUCCESS |  
2024-05-31 16:26:23,563 | INFO  | OMAudit | user=dlfknslnfslf | ip=192.168.96.9 | op=COMMIT_MULTIPART_UPLOAD_PARTKEY {volume=s3v, bucket=bucket-bcqjqldpje, key=multipart.key, dataSize=8388608, ETag=f4e411ff337150ed3523d5d46e4babdc, partNumber=1, partName=/s3v/bucket-bcqjqldpje/multipart.key-0ac48c33-a70c-4cd0-935a-e2322d7495e2-112536635482112000-1} | ret=SUCCESS |  
2024-05-31 16:26:23,591 | INFO  | OMAudit | user=dlfknslnfslf | ip=192.168.96.9 | op=COMPLETE_MULTIPART_UPLOAD {volume=s3v, bucket=bucket-bcqjqldpje, key=multipart.key, dataSize=0, multipartList=[partNumber: 1 partName: "f4e411ff337150ed3523d5d46e4babdc" eTag: "f4e411ff337150ed3523d5d46e4babdc" , partNumber: 2 partName: "7e545caeb052915b4e76bbdf290c5c3a" eTag: "7e545caeb052915b4e76bbdf290c5c3a" ]} | ret=SUCCESS |  

[sodonnel]

LGTM. Thanks for increasing the test coverage in this area.

[adoroszlai]

Thanks @sodonnel for the review.