FormTokenField: Improve use case stories

[mirka]

What?

Improves the stories for FormTokenField so the solutions to common use cases are easier to discover.

Why?

• The displayTransform prop was not covered in the custom render story.
• It was slightly unclear that the With Validated Input story was demonstrating how you can disallow a user from adding new tokens.

Testing Instructions

npm run storybook:dev and see the stories for FormTokenField.

[github-actions]

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Co-authored-by: mirka <[email protected]>
Co-authored-by: tyxla <[email protected]>

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[elazzabi]

Changes look good! Thank you for making it easier for us 🙏

[github-actions]

Flaky tests detected in 9385ca5.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/16809563734
📝 Reported issues:

• [Flaky Test] ensures List View global shortcut works properly #51533 in /test/e2e/specs/editor/various/list-view.spec.js

[tyxla]

LGTM 👍