enhance(ui): add better error messages for duplicate key in config.edn

[sallto]

fixes #8419

[logseq-cldwalker]

@sallto I can take a look at this once tests are passing. Putting this on hold in the meantime

[andelf]

Many thanks.
I'm planning to integrate this into the file editor directly like #8584

See-also: https://codemirror.net/5/demo/lint.html

[Bad3r]

I'm planning to integrate this into the file editor directly like #8584

The error message is still useful for when users edit config.edn outside of Logseq

[sallto]

I'm sorry for not getting back to you sooner. I was very busy with University. CI is passing now.

[Bad3r]

@sallto no worries that takes priority. Good luck!

[logseq-cldwalker]

@sallto No worries. Could you add a test for this error like the other error messages in this file? See frontend.handler.common.config-edn-test

[logseq-cldwalker]

@sallto Thanks for the error message and test! 👍 🚢 Works great