Add a backing field for EditorUIAlias and track changes when its set.#19733

AndyButland merged 3 commits intoumbraco:mainumbraco/Umbraco-CMS:mainfrom

KevinJump:v16/bugfix/19732-EditorUIAlias-DirtyChangeKevinJump/Umbraco-CMS:v16/bugfix/19732-EditorUIAlias-DirtyChangeCopy head branch name to clipboard