Change warning message for Managed charts

[nwmac]

Internal Reference: SURE-9100

For Helm applications, the annotation catalog.cattle.io/managed has been updated, so that as well as being true it can be a value which indicates that Rancher manages the application.

We already have some handling for the managed message that we show, but this needs to be updated to match the new backend behaviour.

Message should be:

Warning, <MANAGER> manages deployment and upgrade of this application. Upgrading this app is not supported through this interface

where <MANAGER> is 'Rancher(or the vendor) if the annotation istrue`, otherwise it is the value of the annotation.