feat(lib): Remove useless mixin rfs and font-size + remove vendor

[louismaximepiton]

Types of change

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

Related issues

Following twbs/bootstrap#41938.

Context & Motivation

Reduce our bundle size on CSS and remove dead code.

Description

Removes the rfs mixins and functions, as well as the font-size mixin.

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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[Copilot]

Pull request overview

This PR removes the RFS vendor implementation and related Sass mixins (rfs, font-size) across the SCSS codebase to reduce CSS bundle size, and updates the site/config/docs accordingly.

Changes:

• Remove the RFS vendor file and all remaining @include rfs(...) / @include font-size(...) usages, replacing them with direct font-size: / CSS variable assignments.
• Simplify utilities generation by dropping the RFS-specific branch and its tests.
• Remove rfs_version from site config validation and from brand config files; update docs/migration notes to reflect the breaking change.

Reviewed changes

Copilot reviewed 39 out of 40 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
site/src/scss/_component-examples.scss	Replace @include font-size(inherit) with font-size: inherit.
site/src/libs/validation.ts	Remove zPrefixedVersionSemver validator (no longer needed).
site/src/libs/config.ts	Drop rfs_version from config schema/imports.
site/src/content/docs/utilities/api.mdx	Remove the (commented) rfs utility option row.
site/src/content/docs/getting-started/migration.mdx	Add migration notes about RFS/vendor and font-size() removal.
site/src/content/docs/getting-started/migration-from-boosted.mdx	Add similar migration notes for Boosted migrations.
site/src/content/docs/foundation/options.mdx	Remove $enable-rfs mention from options table.
scss/vendor/_rfs.scss	Delete the embedded RFS implementation.
scss/utilities/_api.scss	Remove the RFS rescaling media-query generation block.
scss/tests/mixins/_utilities.test.scss	Remove RFS-related generate-utility tests.
scss/mixins/_utilities.scss	Remove $is-rfs-media-query arg + RFS value selection logic.
scss/mixins/_pagination.scss	Replace @include rfs(..., --var) with direct CSS var assignment.
scss/mixins/_forms.scss	Replace @include font-size(...) with font-size:.
scss/mixins/_buttons.scss	Replace @include rfs(..., --var) with direct CSS var assignment.
scss/forms/_labels.scss	Replace @include font-size(...) with font-size:.
scss/forms/_input-group.scss	Replace @include font-size(...) with font-size:.
scss/forms/_form-text.scss	Update comment to reflect direct font-size replacement context.
scss/forms/_form-control.scss	Replace @include font-size(...) with font-size:.
scss/_variables.scss	Remove $enable-rfs variable.
scss/_type.scss	Update comments to reflect direct font-size replacement.
scss/_tooltip.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_toasts.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_root.scss	Replace @include rfs(..., --body-font-size) with direct CSS var assignment.
scss/_reboot.scss	Replace @include font-size(...) with font-size: in reboot rules.
scss/_progress.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_popover.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_pagination.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_navbar.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_nav.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_mixins.scss	Stop importing vendor RFS.
scss/_images.scss	Replace @include font-size(...) with font-size:.
scss/_dropdown.scss	Replace RFS/css mixin usage with direct var assignment + font-size:.
scss/_buttons.scss	Update comment reflecting removal of --btn-font-size handling.
scss/_accordion.scss	Replace @include font-size(...) with font-size:.
packages/sosh/scss/ouds-web-grid.scss	Remove @import "@ouds/web-common/scss/vendor/rfs".
packages/sosh/config.yml	Remove rfs_version entry.
packages/orange/scss/ouds-web-grid.scss	Remove @import "@ouds/web-common/scss/vendor/rfs".
packages/orange/config.yml	Remove rfs_version entry.
packages/orange-compact/scss/ouds-web-grid.scss	Remove @import "@ouds/web-common/scss/vendor/rfs".
packages/orange-compact/config.yml	Remove rfs_version entry.

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