Backport PR #53189 on branch 2.0.x (BUG/CoW: Series.rename not making a lazy copy when passed a scalar)
Backport PR #53189: BUG/CoW: Series.rename not making a lazy copy when passed a scalar
cc @lithomas1 looks like this broke something here. Can you take a look? Hm, I see what's going on. The lazy copy is not taking place since, we're missing #51698 on 2.0.x, that allows df["blah"] = series to do a lazy copy.

Ideally I'd like to continue backporting this, so is it fine if I just revert the test changes for now? Yep sounds good to me