Resolve #3401176 "Allow to drag with get paragraph"

Andy Broomfieldrequested to merge
issue/layout_paragraphs-3401176:3401176-allow-to-drag-with-get-paragraph into 2.0.x

Closes #3401176

Re-adds getParagraph() to src/Form/ComponentFormBase.php as an alias of getEntity() This is for backward compatibility and fixes an issue with the original patch and Mercury editor.

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