feat(server): Restructure videos directory by label

[evan10s]

• Modifies the videos directory so video labels are represented as folders
• Uploaded videos are moved into an uploaded directory within their label directory
  • This allows videos that are already uploaded to be indicated in the UI
  • In sandbox mode, videos are not moved the the uploaded directory, but the from/to paths are printed in the logs for confirmation purposes

Other goodies:

• Queue all button changes to Queue all remaining to clarify that it will only trigger uploads on videos that have not been uploaded yet
• If a video file doesn't exist at upload time (which may be seconds or minutes or hours past when it was queued for upload), the job fails with the error but will no longer crash the worker

Fixes #78 Closes #49 Closes #69

TODO:

• [x] Update readme
• [x] Update in-app instructions on where to put video files
• [x] Include breaking change note in commit description before merging: BREAKING CHANGE: The structure of the videos directory has changed to include video labels as subdirectories, and you will need to adjust your workflow accordingly. Details of the new structure are available in the README at https://github.com/gafirst/match-uploader/blob/main/README.md#video-directory-structure.

[github-actions[bot]]

:tada: This PR is included in version 3.0.0 :tada:

The release is available on:

• GitHub release
• v3.0.0

Your semantic-release bot :package::rocket: