Offer only allowed updates on UI/CLI

[christophenne]

Is your feature request related to a problem? Please describe.
As of now, we show the update button (and the "vX.Y.Z available" in the CLI) whenever the latestVersion is not the installed version. The first problem with this is, that the user might be on a more current version than latest (see #329). The second one is, that it might not be possible to update to the latest version, because the package is required as a dependency by another package, or because a dependent package cannot be updated. Maybe there are even more cases where an update is not possible – TBD.

Describe the solution you'd like
UI/CLI should only offer the user to only show the updates that are possible in their cluster. This means that a package might not be able to be updated to latest version but to a version below that, or maybe not be able to be updated at all.

Parts of this have been done in #401 – but right now we don't offer the latest possible version to update to, we just don't offer an update at all.

Describe alternatives you've considered
Not implementing this and instead showing an error to the user that the update is not possible. This would still be possible but be a bit confusing and inconsistent. Also, it would not be possible to update to a lower version than latest.

Additional context
Kind of related in terms of same code that will be touched: #329
Prior work on this: #401

[hanshal101]

Hey @christophenne I would like to work on this. Can you give me some more information on this.

[christophenne]

Hi @hanshal101, thanks a lot, but we have to talk about this one internally first, I think it's better to pick another issue – as always the ones labelled "help wanted" are a good choice. If you are still interested in #441 for example, and if you don't have any other issues assigned right now (except for the one where the PR is open), I think that would be a good issue to look at now.