Specify ContentLength for part uploads

[f8k8]

Issue

4767

Description

The UploadPartCommand is passed the original parameters, which may include ContentLength. If the ContentLength is included in the original parameters, and the upload is larger than a single chunk, UploadPartCommand has an incorrect value for ContentLength. This change passes the actual size of the chunk as ContentLength, or makes sure it is undefined if the part size is not calculated.

Testing

After upgrading from SDK v2 to v3, our uploads were hanging and eventually timing out. Making this change in our local copy of the SDK fixed the uploads.

Additional context

Checklist

• [ ] If you wrote E2E tests, are they resilient to concurrent I/O?
• [ ] If adding new public functions, did you add the @public tag and enable doc generation on the package?

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