OXUI-277 Generalize service provider selection list of file storage accounts
Implement OXUI-277.
Feature checklist
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created mock-ups first -
checked on mobile devices (at least in dev tools)
Implementation notes
Since this is basically a simple refactoring and some cleanup, I guess reviewing can be skipped. The basic behaviour has been proven in production since 7.8.2, AFAIK, and has just been adopted to be used in more dialogs.