Please confirm these before moving forward.

• I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
• This improvement refers to an existing feature. If you want to suggest a new feature, please use this template.
• This improvement is not a bug. If you want to report a bug, please use this template.

Describe the improvement

I think it would be really helpful if one could configure UniGetUI to get update notifications only for certain package managers. For example I have Python installed, but most of my apps come from either winget or Powershell Gallery. I am flooded with Python libraries that are just a dependency in most cases and actually can't be updated for various reasons. I know I can disable the package manager, but I actually don't want to. I want to be able to see the updates when I go to Software Updates if I want to update something manually, but at the same time having them in the scheduled update check is not super helpful.

Describe how this improvement could help users

I think the benefit would be that without disabling a specific package manager, I still can do manual updates, but I'm not spammed with them during scheduled update checks.