[FEATURE REQUEST] Solutions for stuck pkg 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

For a couple of days when opening UniGet on the update section it would infinitely be 'loading'. Winget updates would show and update, but it would keep 'loading' infinitely and no PiP updates showed. The PiP logs didn't supply any useful information on this. I ran it in the terminal myself and saw that some extra url was down (apparently permanently) and that's what made it all very slow.

As far as UniGet is concerned my suggestions here would be:
- As far as possible to catch similar erros or warnings and notify the user, with different options, like stop, etc...
- Before I had to switch off the 1-minute limit in order to get the pip updates to show up in the first place. Perhaps an additional setting to set a different limit, could help to prevent these kind of issues?
- I had posted on that issue before [that it would be nice to be notified about such things instead of having to go through the logs where it says one could change that setting](https://github.com/Devolutions/UniGetUI/issues/4653#issuecomment-5242821043). In this case, though, a notification that it timed out and therefor no possible updates are shown, perhaps?
- The possibilty to stop the checking/loading (without having to close and reopen UniGet).

Thanks!!!

### Describe how this new feature could help users

Make the update experience better and less frustrating when (outside of UniGet) issues occur, and easier to resolve.

Start in the update section and reproduce the indefinitely loading state with PiP updates while checking the PiP logs and terminal output. Clarify which of the requested behaviors belongs in scope—error notifications, a configurable time limit, timeout notices, or cancellation—and define acceptance criteria for each before locating the implementation and tests.

Written by the indexing model from the issue text.