WIP: Ignore file collissions when uploading files to Skynet

MERGE REQUEST

Overview

When uploading files to skynet, do not error out when the file already exists (if the hashes match).

Open questions:

• should we lock this behind a flag, similar to force?
• what if the redundancy of the new file is different form the redundancy of the existing one?

Example for Visual changes (ie Screenshot)

N/A

Issues Closed

Closes #3870

Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• All new methods, or updating methods have clear docstrings
• Testing added or updated for new methods
• Any new packages are added to Makefile and .gitlab-ci.yml
• API documentation updated for API updates
• Module README.md updated for changes to work flow
• Issue added to Sia-UI repo for new supporting features
• Changelog updated