[Workbench2] Improve error handling and reporting
Improve error handling and reporting for failed promises/async methods and internal errors by dispatching actions to an single reducer, which maintains error state (i.e. a list of errors, the ability to add/remove/clear errors).
- Related to Story #15333: [Epic] Workbench2 has reached feature parity with Workbench, so that that latter can be deprecated added
- Target version set to To Be Groomed
- Blocked by Story #15335: [Workbench2] Integration testing added
- Related to Story #15603: [Workbench 2] Update Fileupload component to new error reporting & unit test architecture added
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