Description

Earlier the entire error stack trace was shown when config.yaml had errors. This PR fixes that by showing only the error message which is the first line of the error.

closes #9547

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• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Show only the first line of config.yaml error messages in the Configs section, preventing full stack traces and making errors easier to scan.

^{Written for commit e3a8711. Summary will update on new commits.}