refactor(ui): harmonize progress bar handling
Description
The following discussion from !1003 (merged) should be addressed:
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@dweckmann started a discussion: I would add an issue to remember the "loss" of functionality. The "handler" should emit the standard job signals.
Proposal
We need to harmonize all the code that triggers progress bars.
Functional specifications
Usually a refactor does not alter functional specifications, but if there is any change to the workflow, UX/UI design, screenshots, etc..., please describe it here
Technical specifications
Details of the implementation
Test plan
Describe how you will verify that the implementation fulfils the specifications