fix cell height when updating output

[jonah-iden]

What it does

This fixes an issue that the cell height was not updated in the output webview after rendering an output. This lead to overlap of output with other cells

How to test

• Open a notebook
• create a few cells and execute them
• validate that changing the cell height (by for example ading a line) the distance between cell and output does not change anymore.

Follow-ups

Breaking changes

• This PR introduces breaking changes and requires careful review. If yes, the breaking changes section in the changelog has been updated.

Attribution

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[dhuebner]

Looks good to me. Thanks!
The bogus behavior is no longer reproducible.