Make ckeditor_indentblock compatible with Drupal 10 and CKEditor 5

Michael Caldwellrequested to merge
issue/ckeditor_indentblock-3338085:3338085-make-ckeditorindentblock-compatible into 8.x-1.x

Enable the IndentBlock functionality included with CKEditor 5 core.

@todo: Implement per-format config to disable IndentBlock.

Closes #3338085

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