[Improvement] File upload: cancel ongoing upload

[keunes]

Hello,

Connected to #3945, it would be great if the ECL File upload composition would be ready for cancelling an ongoing upload.

https://ec.europa.eu/component-library/playground/ec/?path=/story/compositions-file-upload-status--default&globals=viewport:responsive

E.g. when hovering "Upload [spinner]", that 'Cancel [cross icon?]' appears.