feat(social-profiles): change all references to twitter by X

[mager19]

Description

This pull request updates all references from "Twitter" to "X" in the Social Profiles and Share blocks, following the platform’s rebranding.

Issue: 2638
#2638

Screenshots

https://cln.sh/lp2SDC35
https://cln.sh/0YFCc9RS

Types of changes

• Renaming the slug, name, placeholder, and accessibility labels from "twitter" to "x".
• Updating configuration files (block.json, PHP render files, and JS files for editing and transforms.
• Adding and updating SVG icons to reflect the new X branding.
• Adjusting related styles.
• Updating transforms and inspector logic to support the new name.

How has this been tested?

No user data was changed, only the visual and code references.

Checklist:

• My code is tested
• [ x] My code follows accessibility standards
• [ x] My code has proper inline documentation
• I've included any necessary tests
• I've included developer documentation
• I've added proper labels to this pull request