Textbox Editor has excessive tab stops
<!--IssueSummary start-->
<details>
<summary>
Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards.
</summary>
- [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=422739)
- [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=422739)
</details>
<!--IssueSummary end-->
### Summary
Every button in the toolbar has a tab stop, this makes keyboard navigation more difficult.

### Steps to reproduce
Place focus on the text box
Tab 14 times to move the selection outside of the textbox.
### What is the current _bug_ behavior?
Moving though forms which contain a text box includes many extra tabs
### What is the expected _correct_ behavior?
A single tab stop for the toolbar
### Possible fixes
Ideally the toolbar would be a single tab stop with space/enter to add focus OR allow selecting the option via arrow keys.
issue