Fix: long unhyphenated text overflows the container

[Rishit30G]

What?

Fixes: #73707

Why?

This will help fix the issue where long, unhyphenated text overflows the container in the side panel where the author’s name appears.

Testing Instructions

To test in the post editor:

• Create a new user for your test site with a really long username with no hyphens
• Go to create a post and assign this post to that username
• See how the username can overflow the container

Screenshots or screencast

Before	After

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Co-authored-by: Rishit30G <rishit30g@git.wordpress.org>
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
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[Rishit30G]

Added fix for Template and Discussion overflowing text in Post Editor

Before	After

[ntsekouras]

We shouldn't use classnames from the components package. Instead we should add a specific classname in toggleProps of post template panel.

Wondering though if this should also be added (not in this PR) for the dropdown menu toggle. --cc @mirka

[mirka]

Right, I think one could argue that this should be added to Button even.

I just noticed something wild though, which is that the non-default variants (e.g. primary) of Button have white-space: nowrap set, while the default variant does not 😅 I don't understand the reasoning for that choice, but in any case I think it'd be fine to add word-break: break-word to Button. It wouldn't affect variants that don't allow wrapping, and will result in better wrapping behavior for the variant that does allow it.

[ntsekouras]

Thanks for the PR! Closing though since it was resolved by: #76071