We should exclude the push database from backup since it contains state such as endpoints and keys that shouldn't be shared across devices.
<rdar://problem/104806715>
Pull request: https://github.com/WebKit/WebKit/pull/9298
Committed 259563@main (b97e13eff45f): <https://commits.webkit.org/259563@main> Reviewed commits have been landed. Closing PR #9298 and removing active labels.