Adjust selection after cherry-picking commits

Keep the same commit selected, by moving the selection down by the number of
cherry-picked commits. We also do this when reverting commits, and it is
possible now that we use a sync waiting status.

We also need to turn the refresh that happens as part of CheckMergeOrRebase into
a sync one, so that the commits list is up to date and the new selection isn't
clamped.

pkg/integration/tests/cherry_pick/cherry_pick_range.go

@@ -70,9 +70,9 @@ var CherryPickRange = NewIntegrationTest(NewIntegrationTestArgs{
 				t.Views().Information().Content(DoesNotContain("commits copied"))
 			}).
 			Lines(
-				Contains("four").IsSelected(),
+				Contains("four"),
 				Contains("three"),
-				Contains("two"),
+				Contains("two").IsSelected(),
 				Contains("one"),
 				Contains("base"),
 			)