assert error-user-registration-custom-field directly after users.register formats this Meteor.Error correctly

[github-actions]

📝 Found in apps/meteor/tests/end-to-end/api/users.ts#L1197

Commit: e68aeda

[coderabbitai]

🔗 Related PRs

#40496 - fix: clean up login tokens in users.deactivateidle [merged]
#40626 - regression: Password TOTP failing for meteor methods [merged]

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