Handle page-level errors at the parent component level (Add-ons flow)
What does this MR do and why?
Describe in detail what your merge request does and why.
This MR is the first step in completing the work related to #386772 (closed). In particular, it brings the error display handling to a centralised place for the Addons Purchase flow, namely checkout.vue and app.vue components.
This MR ignores the PaymentMethod component. To handle errors coming from it, we first need to replace the currently used Zuora component with ZuoraSimple, which relies on event messages.
The MR should bring no actual visual changes.
| Title | MR |
|---|---|
| Handle all page-level errors at the parent component level (Add-ons flow) |
|
| Handle all page-level errors at the parent component level (subscription flow) | tbd |
| Handle payment-related errors at the parent component level | !108095 (merged) |
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