Issue #3385030

1. Pulled latest changes from original repository to the fork branch
2. Resolved conflicts between latest changes and patch
3. Add trait FieldTableCellProcessingHelperTrait that provide the helper function for checking cells processing type.
4. Fixed issue with export that noticed in comment: https://www.drupal.org/project/tablefield/issues/3076448#comment-15861295

Closes #3076448