fix: ui node input attributes key added

[hperl]

Migrated from #3143

Pattern for UI to show error when code field has other characters than numeric.

Related issue(s)

Elements issue 78

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
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  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[zepatrik]

I don't really understand how this fixes the issue where the email is the value of the code field 🤔
But the change makes sense in general.

[hperl]

I don't really understand how this fixes the issue where the email is the value of the code field 🤔 But the change makes sense in general.

I didn't look into the actual fix much except for getting the PR to pass on a current master.