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Draft: Resolve "Improve dropdown element to allow multi select"

What is in this MR

The dropdown element allows to select one value from a set of options. We now want to allow to use this component as a multiselect element.

Steps:

  • Add an option to allow multiple selection
  • Implement the multi selection
  • Accept arrays as input values (needs a ensureArray ensurer)

How to test this MR

  • Create a page in the application builder
  • Add a DropdownElement
  • Test the new multiple flag and the default value accordingly (you can use comma separated values)

Merge Request Checklist

  • changelog.md has been updated if required.
  • New/updated Premium/Enterprise features are separated correctly in the premium or enterprise folder
  • The latest Chrome and Firefox have been used to test any new frontend features
  • Documentation has been updated
  • Quality Standards are met
  • Performance: tables are still fast with 100k+ rows, 100+ field tables
  • The redoc API pages have been updated for any REST API changes
  • Our custom API docs are updated for changes to endpoints accessed via api tokens
  • The UI/UX has been updated following UI Style Guide

Closes #2515

Edited by Andrea Disarò

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