Corpus Management - Corpus Upload - Upload Corpus

Based on plan in #341338 (comment 683187524)

Rough Implementation Plan

• Do mutation to post to upload file to https://docs.gitlab.com/ee/user/packages/generic_packages/index.html#publish-a-package-file with status hidden.
• As upload progresses, update percentage uploaded
• Also see if #327897 (closed) is still practical now that we have real data and mutations. Probably use a prop and emit events up to the base component to handle mutations.

Step 1. Create a Generic package using the endpoint https://docs.gitlab.com/ee/user/packages/generic_packages/index.html set:

package_name: corpus*
status: hidden

Public API Docs:

https://docs.gitlab.com/ee/api/packages.html#delete-a-project-package

Internal API Docs:

https://docs.gitlab.com/ee/user/packages/package_registry/