feat: hook up file upload widget to backend

Doesn't yet do anything with the resulting URL.

Once !31 (merged) is merged, validation should be added to ensure that a file has been uploaded.

added 13 commits

• d7b28800...85eda060 - 10 commits from branch master
• 41274ba3 - feat: hook up file upload widget to backend
• bfad5f2a - test(FileUpload): add file upload to e2e happy path
• 93ccfd33 - refactor(FileUpload): add data-test-id to FileUpload

Compare with previous version

merged

mentioned in commit 1a061a22