Programmatic upload of files

[Tbaut]

Many files interactions require a first step of files being uploaded. While this flow is tested once in the files-management spec. All the subsequent tests (such as testing for the file deletion) should not use the UI to upload files.

I imagine this involves:

• create a new fileUpload command
• mimick (or better, export and re-use) uploadFiles from packages/files-ui/src/Contexts/FilesContext.tsx
• use this in place of the manual process

[Tbaut]

Removed myself from this after figuring out it'll be much bigger than expected (and it's not really a priority as of now). Unless we want to duplicate many things (we don't want!). We need to:

• get the private key from localStorage decodedRefreshToken.enckey
• extract the encrypting functions used in react context to make sure we can import them in the test
• use those functions to encrypt the files
• use FilesApiClient to upload them