Instead of letting users go through the project creation process only to get rejected with a "subscription limits reached" message, now the "New Library project" button is being replaced with an "Upgrade plan" button when the maximum allowed projects have been reached for the specific amount. The button is accompanied by a tooltip that explains the situation to the user. Once clicked, the user is redirected to the subscriptions page.
CURA-8112
Users with an account and an UM printer should have some basic access to the Digital Library. To this end, and to remain future proof, the online team has made an extension to its API so now feature budgets can be gauge. At the moment it's only checked wether the user has any access to personal projects at all. If so, the interface shows Digital Library functionality. Known issue: Removing the last printer from DF while still logged in leaves the DL access in the Cura interface until logged out or Cura restarted. Additionally, I think the response for a logged in user without any printer from the API is just 'data = empty list' instead of everything set to False and 0 (which should be the case as they're all listed as required fields in their docs ... maybe I'm missing something). In any case, the code as is now can handle that as well.
CURA-8138
