ICSHWI 8272 refine error handling

Error messages on dialogs instead of snackbar for:

• Login dialog
• Create IOC dialog
• Deploy IOC dialog
• Undeploy IOC dialog
• IOC admin page: modify and delete IOC

requested review from @imretoth and @simonrose

assigned to @zoltanrunyo

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• ca6a5719 - ICSHWI-8272: Provide error code in case of failed backend API call

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• b898609c - ICSHWI-8272: Fix component tests

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• b9c58e25 - ICSHWI-8272: Revert 'Provide error code in case of failed backend API call'...

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• ed184f57 - ICSHWI-8272: Provide error code in case of failed backend API call

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• 3d73d0ce - ICSHWI-8272: Provide status code of backend API calls (for responses with no content)

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