fix(datasets): fix datasets files put command

[lamroger]

Overview:
The command was getting a presigned url without providing file name and would get 403'd

Test plan:

1. Create a dataset version: gradient datasets versions create --id <dataset id>
2. Start various ways of putting files

gradient datasets files put --id <dataset ref from above> --source-path file.txt
gradient datasets files put --id <dataset ref from above> --source-path workflow.yaml --target-path helloworld/
gradient datasets files put --id <dataset ref from above> --source-path workflow.yaml --target-path helloworld/yoloswag
gradient datasets files put --id <dataset ref from above> --source-path random/test/

putting a file, putting a folder, putting a file in a target path
3. Commit the dataset python gradient datasets versions commit --id <dataset ref from above>
4. Verify in CLI or UI that files are where they are expected to be

[PSBOT]

🎉 This PR is included in version 1.7.7 🎉

The release is available on GitHub release

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