CKEditor 5 alignment now available via toolbar dropdown only

Prior to this change, alignment controls could be added to the CKEditor 5 toolbar as individual buttons for each alignment type or consolidated into a dropdown that provided options for each alignment option.

The individual alignment buttons have been removed, making the alignment dropdown the only way to add alignment within CKEditor. After running update.php. configurations that used individual alignment buttons will be converted to use the alignment dropdown instead. All content and functionality is preserved. The only impact is that users accustomed to using individual buttons to apply alignments will now be doing so via a dropdown.