Ability to Cancel in-flight form changes.

There have been times where our Form indicates Pending changes but there is no visibility into what changes are pending and will be made if we Publish. This makes it difficult for us to know whether we truly want to Publish or not and is risky if we are mid-change and have an emergency interrupt our work. Having the ability to cancel would ensure we don't Publish any partial or unfinished updates and instead start fresh with our changes.