Fix: add title attribute to Donation Form block iframes

[JoshuaHungDinh]

Resolves:
Accessibility Audit: Give-041
https://lw.slack.com/archives/C0355E6LBMZ/p1736794600442929

Description

The Donation Form block iframes currently lacks a descriptive title attribute and are auto-set to title="iframe"

To improve accessibility, I’ve added a descriptive title attribute to the iframe-resizer components used in the Donation Form blocks. This change ensures that each iframe used for block previews and different display types is properly labeled, enhancing the user experience for those relying on assistive technologies.

Additionally, reorganized the import statements on the files changed.

Affects

• Donation Form block.
• W/ different display types selected. (Modal, Reveal, etc..)
• Both frontend and admin screen.

Visuals

Testing Instructions

• Create a form.
• Create a page with Donation Form blocks using each display type.
• View the iframes in the console and verify that the title attribute has been updated to "Donation Form".
• Repeat last step in the admin block editor and the frontend webpage.

Pre-review Checklist

• Acceptance criteria satisfied and marked in related issue
• Self Review of code and UX completed