Cannot use aab format to publish Carat because of account ownership issues

[lagerspetz]

Solution: Carat must be moved to NODES group Google Play account. This needs us to redirect old users to new version. So, we need:

• One version with current Carat developer account asking users to change to the new one
• One version with NODES account, updated pkg name (e.g. fi.helsinki.cs.nodes.carat.android )