V15: New dropzone component available for the Backoffice (#18753)

* create a symlink between local Client .vscode snippets and global snippets for ease of use

* fix: no need to specify `Element` in the snippet as that is pulled from the filename

Because of our convention with `x.element.ts` you would have ended up with `UmbXElementElement`

* feat: adds new component `umb-input-dropzone`

* docs(storybook): more stories

* feat: construct the temporary files centrally along with an `AbortController` and use its signal

* feat: makes UmbInputDropzone form aware

* feat: introduces a change event

* chore: temporary changes before changing upload field

* feat: adds default slot

* docs: adds jsdocs

* feat: adds more properties

* feat: adds dashed styling

* feat: adds multiple support

* feat: allows to cancel file

* feat: separate **cancel** and **remove**

* fix stylibg

* move dropzone element

* move input-dropzone into dropzone package

* feat: introduces a 'dropzone' package

* import for backward compatibility

* remove ambigious export

* reexport everything from dropzone

* fix import

* cleanup test files

* use correct import paths

* test: make sure folder exists before writing to it

* adds export for modals

* adds entrypoint for dropzone package

* use the AbortController directly on the temporary file object

* uses correct icon name

* feat: adds ability to remove all files and cancel the request

* feat: adds styling for the uploader

and enables it to work in multiple mode with classes over id's

* do not let the content exceed its boundaries

* feat: formats progress with 2 decimals

* feat: formats with 0 decimals

* fix: returns cancel error

* fix: maps cancel errors back to the uploadable item

* fix: do not proceed with media items if the request was cancelled

* chore: mark exports from media <- dropzone as deprecated

* fix: use correct attribute and remove a todo with localizations

* fix: use correct attribute and remove a todo with localizations

* fix: allow to specify parent through attribute

* feat: align attribute `disableFolderUpload` between dropzone components

.vscode/lit.code-snippets

@@ -0,0 +1 @@
+../src/Umbraco.Web.UI.Client/.vscode/lit.code-snippets