V15: Upload folders in dropzone

[loivsen]

Description

Dropzone Manager update that can handle folder uploads.

Changes:

• Dropzone element can now be disabled.
• The dropzone no longer dispatches a change event. Instead listen for progress or complete event.
• The observable completed from dropzone manager has been removed.
• Two new observables added: progress and progressItems
• Dropzone element's method getFiles has been removed. Use getItems instead or observe progressItems.
• createFilesAsMedia has been renamed to createMediaItems
• createFilesAsTemporary has been renamed to createTemporaryFiles
• Can handle uploads of folders - drag in multiple files and folders with files at once and watch the magic ✨

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

[sonarqubecloud[bot]]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[iOvergaard]

This PR now targets V15, but unfortunately, I don't know enough about the code to resolve the merge conflict. We can probably include it in an RC of V15 if we get it resolved.