## Summary

Closes elastic#224820

Remove error state for name field when creating a new knowledge base
entry.

I consulted with @isaclfreire offline about this change and we agreed to
remove the error state completely, as error states are not necessary in
cases where all fields in a form are mandatory in order to continue.

### Before

https://github.com/user-attachments/assets/32aab4ad-e558-4e9c-b9c1-b54e9e20b362

### After

https://github.com/user-attachments/assets/4b873397-66fc-4b9c-be0c-dc118e54bfc9

### Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

- [x] The PR description includes the appropriate Release Notes section,
and the correct `release_note:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)
- [x] Review the [backport
guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)
and apply applicable `backport:*` labels.

(cherry picked from commit 03b3779)