PatchSetInserter: Always copy labels

When creating a new patch set, there is no reason we wouldn't want to
copy labels according to the rules in the label config. Every caller
but one was already calling setCopyLabels(true). The one holdout was
ChangeEditUtil#publish, and this was resulting in buggy behavior. In
particular, editing just the commit message via the inline edit
workflow should copy label scores if copyAllScoresIfNoCodeChange is
set.

Change-Id: I3451f86559388868bdbcac612e6d400f38b86bd0
ChangeEditIT: Test for copyAllScoresIfNoCodeChange

Change-Id: I3bde5f792a85ba559d3aef3bd0477aca2259b246