Fix: Embed blocks: adding captions via toolbar - #64385

[hbhalodia]

What?

• Issue - Embed blocks: adding captions via toolbar #64385

Why?

• For consistency, embed block was adding the caption option normally and was visible when we add it, instead we converted to what used in audio, image block. To add the caption via toolbar, making the backend editor consistent across blocks.

How?

• This PR updates the embed block to use the caption via block toolbar.

Testing Instructions

1. Open any page/post in editor.
2. Add the embed block.
3. You can see now, toolbar has option to add the caption, if you click that you would be able to add the caption making it consistent.

Testing Instructions for Keyboard

• NIL

Screenshots or screencast

[github-actions]

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

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[t-hamano]

LGTM!

• The caption still works as before
• If blocks are multi-selected, the caption toolbar button is not visible
• Changing the label makes sense to me