feat: add Label references to utilities and docs

[duvalale]

Types of change

• Non-breaking change
• Breaking change (fix or feature that would change existing functionality and usage)

Related issues

Closes #3610

Context & Motivation

Description

Add label-{small|medium|large|xlarge} references to classes fs-* and to Typography and Text docs.

Checklists

• I have read the contributing guidelines
• My change follows the developer guide
• My change pass all tests
• My change is compatible with a responsive display
• I have added tests (Javascript unit test or visual) to cover my changes
• My change introduces changes to the documentation that I have updated accordingly
  • Title and DOM structure is correct
  • Links have been updated (title changes impact links)
  • CSS for the documentation
• I have checked all states and combinations of the component with my change
• I have checked all the impacts for the other components and core behavior (grid, reboot, utilities)

Checklist (for Core Team only)

• The changes need to be in the migration guide
• The changes are well displayed in Storybook (be careful if example order has changed for DSM)
• The changes are compatible with RTL
• Manually test browser compatibility with BrowserStack (Chrome 120, Firefox 121, Edge 120, Safari 15.6, iOS Safari, Chrome & Firefox on Android)

Progression (for Core Team only)

• Code review
• Design review
• A11y review
• Commit on ouds/main following conventional commit

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Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

[louismaximepiton]

I think the changes in */_semantics.scss files aren't needed since the variables are already defined in the files. In general, these files shouldn't be changed at all, but with tokenator automated PRs.
.bundlewatch.json needs to be updated as well for the CI to pass correctly.

[MaxLardenois]

A little suggestion here

work done, vincent on holidays