Followup for #2003540: Rename Views method op_not_ends() to opNotEnds(). From #1856630: [META] Rename Views methods to core standards.
We have:
#2003558: Rename Views method op_ends() to opEndsWith()
#2003510: Rename Views method op_starts() to opStartsWith()
#2003538: Rename Views method op_not_starts() to opNotStartsWith()
This is the only one that follows a different pattern, so let's rename it.