[FEATURE REQUEST] Add shortcut to install missing package managers

### Please confirm these before moving forward.

- [x] I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
- [x] This proposal is a completely new feature. If you want to suggest an improvement or an enhancement, please use [this template](https://github.com/Devolutions/UniGetUI/issues/new?labels=enhancement&projects=&template=enhancement-improvement.yml&title=%5BENHANCEMENT%5D+%28Enter+your+description+here%29).

### Describe the new feature

Currently is any package manager is not installed there is a message "You may need to install Scoop in order to use it with UniGetUI."
It would be great to have something like "Install ____ package manger" button, that will activate installation command for ex "winget install -e --id pnpm.pnpm"
Or open download page in browser.

### Describe how this new feature could help users

That will save time for searching and installing package managers manually