Embed block: replace twitter icon with x icon

[chrisbellboy]

What?

Changes the Twitter icon in the twitter variation of the Embed block to the X icon.

Why?

The twitter variation in the embed block was still using the Twitter icon.

How?

This changes the title, description, and icon attributes of the Twitter variation.

As the title attribute is no longer Twitter, two new keywords were also added (x and twitter) so the twitter variation remains easily searchable.

The actual variation name remains twitter, since changing this would cause issues for existing Twitter/X embeds.

Testing Instructions

1. Edit a post or page.
2. Embed a tweet by either:
   • Pasting a Twitter/X URL into an empty Paragraph block.
   • Adding a new Embed block and pasting the Twitter/X URL into it.
   • Adding the Twitter/X Embed block variation directly.

Screenshots or screencast

Related: #55142

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[youknowriad]

Thanks for the PR and sorry for missing it. We're landing it here #73110 and I added you to the props.