POS UI Extensions docs updates branch

[runmad]

Related to Shopify/pos-next-react-native#58023

Background

We're updating POS UI Extensions docs.

Solution

This PR updates the documentation for POS UI Extensions components to reflect changes in POS 10.0.0. It adds important notes about deprecated features and visual changes:

• Added deprecation notices for the plain button type, which now defaults to basic
• Documented that List items no longer have dividers
• Added a note that Section no longer has a border
• Updated Tile documentation to reflect changes to the destructive appearance
• Added deprecation notices for the Badge status property
• Added "Important Fixes" sections to the versions documentation, highlighting UI changes in POS 10.0.0 and 10.2.0

These documentation updates help developers understand the visual and functional changes that occurred in recent POS versions.

🎩

• Verified all documentation changes are accurate
• Confirmed deprecation notices are properly formatted
• Checked that version information is consistent across all files

Checklist

• I have 🎩 these changes
• I have updated relevant documentation

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset directory. If the changes are user-facing and should cause a version bump, run yarn changeset to track your changes and include them in the next release CHANGELOG. If you are making simple updates to repo configuration, examples, or documentation, you do not need to add a changeset.