[IMPROVEMENT] The "Manage ignored updates" dialog should allow sorting and filtering the list of ignored updates

[kunszabo]

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

The list of ignored updates is presented in seemingly random order, and this order cannot be changed on the UI.
This unordered presentation should be replaced with a table (initially sorted by name) that would allow sorting, just like the other tables do in the screens of the application.
Searching and filtering the ignored list would be a nice-to-have addition, too.

Describe how this improvement could help users

This improvement would help in quickly finding a certain ignored update or a group of related ignored updates (by name fragment, source, etc.) when the ignored list contains more than a handful of entries, without having to go through the whole list and inspecting each entry one by one.