Improve error messages when fetching Jira user information
What does this MR do and why?
In some cases the user information can't be loaded at all due to permission problems. In those cases the error message "The Jira user is not a site administrator." is misleading.
Related to #351442
Extracted from !90155 (closed) (we can't move forward with that change unfortunately).
How to set up and validate locally
I wasn't actually able to reproduce the permission problem, see my attempt in 90155#how-to-set-up-and-validate-locally
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #351442