Create new DestinationEffect type
Create new DestinationEffect type

DestinationEffect.TYPE.NOOP_AGAINST_PENDING_CHANGE will be used in a
future change to handle the case that
`allow_empty_diff[_patchset]=False` is set and no diff is found.

PiperOrigin-RevId: 386245473
Change-Id: Ib8fa20fc6ca9e4df5e6feb257d632cb403b2be6c

google/copybara,google/copybara,google/copybara