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Add dictionary to map system to friendly errors for purchase flows

Angelo Gulina requested to merge ag/386710-add-dictionary-to-map-system-to-friendly-error-messages-for-purchase into master

What does this MR do and why?

Describe in detail what your merge request does and why.

To tackle &9543 (closed) – and issue: #386710 (closed) – this MR introduces:

  1. a dictionary that helps mapping systems or unfriendly errors to (more) friendly ones
  2. a bit of logic to help the mapping be more resilient
  3. a component, wrapping a GlAlert, dedicated to the Purchase flow to display help with error displaying

(The original idea was to use a Mixin or introduce a new error handling component, the ErrorBoundary. The approach in this MR seems to be more MVC. Additionally, given errors contain links, we can use the safe-html directive only in one place)

Note that the system will be actually introduced with #386723 (closed) – this MR introduces no visual changes.

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Edited by Angelo Gulina

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