chore: improve error notifications in annotations and notebooks (cherry-pick) #6953
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This is a cherry-pick of pr #6927 and commit 71f8c45
I noticed that annotations and notebooks could display the api error
when requests fail - they are not consistent about it.
Including the underlying error in error messages, this improves
notebooks, dashboards, labels, and annotations. Many other error
notifications all need improving e.g. in tasks and secrets.