* allow fellows to abdicate voting rights

* rename founders to founding fellows, give equal power

* Drop FoundingFellow role and veto call (#12762)

* drop FoundingFellow role

* drop veto call

* Storage migration to remove founder role (#12766)

* storage migration to remove founder role

* skip migration if no members

* truncate the final fellows set if overflows

* change log - action order

* MemberAbdicated -> FellowAbdicated

Co-authored-by: Muharem Ismailov <ismailov.m.h@gmail.com>