Onboarding: display a clear message/CTA when website creation process fails

[Robertght]

Quick summary

Coming from here and pfYzsZ-45-p2 I'm opening this report separately.

Steps to reproduce

N/A

@ellatrix if you remember more about this and what steps we can take to replicate, please edit this section.

What you expected to happen

To see a button to refresh or a message that the website creation process failed.

What actually happened

The screen remained stuck on loading with errors in the browser console:

Impact

One

Available workarounds?

No and the platform is unusable

If the above answer is "Yes...", outline the workaround.

No response

Platform (Simple and/or Atomic)

No response

Logs or notes

No response