* [project-history] add best effort flush when cloning project
* [web] update labels in clone project modal for admins
* [project-history] do not shadow history flush failure
* [web] fix accessible label for 'Add comment' button
* [chat] clone comment threads when cloning project with ranges
GitOrigin-RevId: ef30204c8a94b3d6204d56dcca2f62a46319996b