Simplify error message when field cannot be found on update

[gr2m]

Please avoid duplicates

• I checked all open bugs and none of them matched my problem.

Reproducible test case

No response

Please select the environment(s) that are relevant to your bug report

• Browsers
• Node
• Deno

Versions

1.3.1

What happened?

When I try to update a custom field "Type" I get the follow error message

[github-project] "type" could not be matched with any of the existing field names: "Title", "Assignees", "Status", "Labels", "Linked Pull Requests", "Reviewers", "Repository", "Milestone", "Target Date", "NotType"

I think we should remove all the read-only fields, which would make this message much more readable

[github-project] "type" could not be matched with any of the existing field names: "Title", "Status", "Target Date", "NotType"

Would you be interested in contributing a fix?

• yes