FIO-8621: error event on file upload adding

[Maria-Golomb]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-8621

Description

‘fileUploadError’ event was added. Event contain information about the upload error received from a file storage provider.

Breaking Changes / Backwards Compatibility

Dependencies

How has this PR been tested?

Autotests

Checklist:

• [х] I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above