Delete/unstar predefined package support

[bozidarsevo]

As a follow up on #14589 we need to add support for deleting/unstaring predefined packages.
Backend will add the ability to do that with sending additional parameter(s)

Thread: p1733994611260289-slack-C02KUCFCSFP

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.