Plugin: Error message for project quota reach should be nicer

[mergin-maps-bot]

What happens
In the QGIS plugin, when I am trying to create a project, when the user reached the project number quota, I get an error with badly formatted text:
"Failed to create Mergin Maps project.
('{"code":"ProjectsLimitHit","detail":"Maximum number of projects is reached. Please upgrade your subscription to create new projects (ProjectsLimitHit)","projects_quota":2}\n', 'Namespace: pricingnew-individual, project name: newpr')
"
I believe we should change it to look better

How to reproduce

1. create a workspace with an individual subscription
2. create 2 projects into it
3. log in to the WS in the QGIS plugin and try to create a new project
   ➝ you get badly formatted error

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Author of the original task:
Jozef Budac

Original tags:
migrate to github

Original task URL: https://app.clickup.com/t/861mpybpr