Issue #3633056: Read the entity browser selection from the raw POST...

Fabien Clémentrequested to merge
issue/ckeditor5_entity_browser-3633056:3633056-radio-selection-badrequest into 3.0.x

Issue #3633056: Read the entity browser selection from the raw POST parameters, as an array (checkboxes) or a string (radios)

Closes #3633056

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