fix(definition-list): correct font styling of dt and dd elements

[Parsium]

Proposed behaviour

• Make dt elements use Sage UI Medium font (design token not used due to current font weight discrepancies between Carbon and Design System which are being addressed).
• Make dd elements use Sage UI Regular font.
• Add underline back to links within DefinitionList to match Design System guidelines on links.

Current behaviour

• All text elements within DefinitionList use Sage UI Medium.

Checklist

• [x] Commits follow our style guide
• [x] Related issues linked in commit messages if required
• [x] Screenshots are included in the PR if useful
• [x] All themes are supported if required
• [x] Unit tests added or updated if required
• [x] Cypress automation tests added or updated if required
• [x] Storybook added or updated if required
• [x] Translations added or updated (including creating or amending translation keys table in storybook) if required
• [x] Typescript d.ts file added or updated if required

QA

• [ ] Tested in CodeSandbox/storybook
• [ ] Add new Cypress test coverage if required
• [ ] Carbon implementation matches Design System/designs
• [ ] UI Tests GitHub check reviewed if required

Testing instructions

Double check dd and dt elements are using the correct font variants as described in the proposed changes.

[codesandbox-ci[bot]]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 60826dfc07ddbbfd25df71eac173cb1db4965807:

Sandbox	Source
carbon-quickstart	Configuration
carbon-quickstart-typescript	Configuration

[cypress[bot]]

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Test summary

3464 • 0 • 3 • 0 • 0

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Run details

Project	carbon
Status	Passed
Commit	60826dfc07
Started	Oct 27, 2022 10:22 AM
Ended	Oct 27, 2022 10:28 AM
Duration	06:15 💡
OS	Linux Debian - 11.4
Browser	Chrome 106

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[harpalsingh]

While we stil have to update all fonts where we re-set the 500/700/900 weights, this PR only updates 400 and looks all good to me in the storybook test, so this font PR can be progressed.

[carbonci]

:tada: This PR is included in version 111.8.1 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: