* Move manifests to their own API group and fix access policies * Update OpenApi.json * add an endpoint to fetch "private" packages, i.e. AllowPublicAccess=false * Review comments * update OpenAPI.json * update OpenApi.json * allow /umbraco/logout to be used for PostLogoutRedirectUris when logging out through the management api * use the Umbraco.Extensions string extensions instead * add constraints to the BackofficeDefaultController to handle the cases of 'install', 'upgrade', and 'logout' --------- Co-authored-by: Jacob Overgaard <752371+iOvergaard@users.noreply.github.com>