feat(typography): allow listitem to inherit variant from parent list

[damienrobson-sage]

In order to reduce replication of code, ListItem now receives information on the variant of the parent List item via context; setting variant on List will pass it to child ListItem components.

Resolves #5413

Proposed behaviour

ListItem now inherits variant directly from it's parent List component

Current behaviour

Customers have to manually define the variant on each ListItem

Checklist

• Commits follow our style guide
• Related issues linked in commit messages if required
• Unit tests added or updated if required
• Storybook added or updated if required

QA

• Tested in provided StackBlitz sandbox/Storybook
• Add new Playwright test coverage if required
• Carbon implementation matches Design System/designs
• UI Tests GitHub check reviewed if required

Testing instructions

Use Storybook to view the new approach/component structure. Additionally, verify that a deprecation warning is thrown if variant is added to any ListItem

[nuria1110]

Looks good to me, my only comment would be that I don't believe this is a breaking change just yet if we are only adding a deprecation warning to ListItem and the prop is still available.

[carbonci]

🎉 This PR is included in version 144.22.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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