Revert "MDL-35520: Autocreate groups based on existing group / grouping membership"

This reverts commit 9d4fee2aa7a369d4587b83cfb678003a88de11b8.
MDL-35520 - Auto create groups - alocating members from specific group or grouping

This adds two advanced options to the autocreate groups form. Groups can be created from an existing group or grouping membership.